発痛性の、発痛の

関: pain generation

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/08/22 04:47:57」(JST)

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Opium poppies such as this one provide ingredients for the class of analgesics called opiates

An analgesic or painkiller is any member of the group of drugs used to achieve analgesia, relief from pain.

Analgesic drugs act in various ways on the peripheral and central nervous systems. They are distinct from anesthetics, which temporarily affect, and in some instances completely eliminate, sensation. Analgesics include paracetamol (known in North America as acetaminophen or simply APAP), the non-steroidal anti-inflammatory drugs (NSAIDs) such as the salicylates, and opioid drugs such as morphine and oxycodone.

In choosing analgesics, the severity and response to other medication determines the choice of agent; the World Health Organization (WHO) pain ladder^[1] specifies mild analgesics as its first step.

Analgesic choice is also determined by the type of pain: For neuropathic pain, traditional analgesics are less effective, and there is often benefit from classes of drugs that are not normally considered analgesics, such as tricyclic antidepressants and anticonvulsants.^[2]

1 Uses
2 Contraindications
3 Classification
- 3.1 Paracetamol/acetaminophen
- 3.2 NSAIDs
- 3.3 COX-2 inhibitors
- 3.4 Opioids
- 3.5 Alcohol
- 3.6 Medical cannabis
- 3.7 Combinations
- 3.8 Alternative medicine
- 3.9 Psychotropic agents
- 3.10 Other drugs
- 3.11 Other classification systems
4 List of drugs with comparison
5 Society and culture
- 5.1 Term
6 Research
7 See also
8 References

Uses

These drugs provide pain management.^{[citation needed]}

Contraindications

There are several classes of analgesic drugs.^{[citation needed]} Each class has a different history of use for treating different sorts of pain and in different sorts of people.^{[citation needed]} It is difficult to make a statement about when such drugs should be avoided.^{[citation needed]}

In general, pain medication should not be used when there is another, less risky alternative.^{[citation needed]} At the same time, people in pain should not experience undertreatment of pain.^{[citation needed]} When a treatment is available to address the pain, a health care provider should recommend that correct treatment and not a lessor treatment which leaves too much pain.^{[citation needed]}

Classification

Tilidine, a type of painkiller

Drugs for pain are typically classified by chemical structure.^{[citation needed]}

They may also be classified in other ways. Sometimes they are classified by use for various classes of medical condition.^{[citation needed]} Other times they are sorted by the needs of special populations who would use them.^{[citation needed]} They might be listed by availability in a geographical area, perhaps to prevent recommending a drug which is illegal in one place even if it is easily available elsewhere.^{[citation needed]}

Paracetamol/acetaminophen

Paracetamol, also known as acetaminophen or APAP, is a medication used to treat pain and fever.^[3] It is typically used for mild to moderate pain.^[3] In combination with opioid pain medication, paracetamol is used for more severe pain such as cancer pain and after surgery.^[4] It is typically used either by mouth or rectally but is also available intravenously.^[3]^[5] Effects last between two and four hours.^[5] Paracetamol is classified as a mild analgesic.^[5] Paracetamol is generally safe at recommended doses.^[6]

NSAIDs

Nonsteroidal anti-inflammatory drugs (usually abbreviated to NSAIDs), are a drug class that groups together drugs that provide analgesic (pain-killing) and antipyretic (fever-reducing) effects, and, in higher doses, anti-inflammatory effects. The most prominent members of this group of drugs, aspirin, ibuprofen and naproxen, are all available over the counter in most countries.^[7] As analgesics, NSAIDs are unusual in that they are non-narcotic and thus are used as a non-addictive alternative to narcotics.^{[citation needed]}

COX-2 inhibitors

These drugs have been derived from NSAIDs. The cyclooxygenase enzyme inhibited by NSAIDs was discovered to have at least 2 different versions: COX1 and COX2. Research suggested most of the adverse effects of NSAIDs to be mediated by blocking the COX1 (constitutive) enzyme, with the analgesic effects being mediated by the COX2 (inducible) enzyme. Thus, the COX2 inhibitors were developed to inhibit only the COX2 enzyme (traditional NSAIDs block both versions in general). These drugs (such as rofecoxib, celecoxib, and etoricoxib) are equally effective analgesics when compared with NSAIDs, but cause less gastrointestinal hemorrhage in particular.^[8]

After widespread adoption of the COX-2 inhibitors, it was discovered that most of the drugs in this class increase the risk of cardiovascular events by 40% on average. This led to the withdrawal of rofecoxib and valdecoxib, and warnings on others. Etoricoxib seems relatively safe, with the risk of thrombotic events similar to that of non-coxib NSAID diclofenac.^[8]

Opioids

Morphine, the archetypal opioid, and other opioids (e.g., codeine, oxycodone, hydrocodone, dihydromorphine, pethidine) all exert a similar influence on the cerebral opioid receptor system. Buprenorphine is a partial agonist of the μ-opioid receptor, and tramadol is a serotonin norepinephrine reuptake inhibitor (SNRI) with weak μ-opioid receptor agonist properties.^[9] Tramadol is structurally closer to venlafaxine than to codeine and delivers analgesia by not only delivering "opioid-like" effects (through mild agonism of the mu receptor) but also by acting as a weak but fast-acting serotonin releasing agent and norepinephrine reuptake inhibitor.^[10]^[11]^[12]^[13] Tapentadol, with some structural similarities to tramadol, presents what is believed to be a novel drug working through two (and possibly three) different modes of action in the fashion of both a traditional opioid and as a SNRI. The effects of serotonin and norepinephrine on pain, while not completely understood, have had causal links established and drugs in the SNRI class are commonly used in conjunction with opioids (especially tapentadol and tramadol) with greater success in pain relief. Dosing of all opioids may be limited by opioid toxicity (confusion, respiratory depression, myoclonic jerks and pinpoint pupils), seizures (tramadol), but opioid-tolerant individuals usually have higher dose ceilings than patients without tolerance.^{[citation needed]}

Opioids, while very effective analgesics, may have some unpleasant side-effects. Patients starting morphine may experience nausea and vomiting (generally relieved by a short course of antiemetics such as phenergan). Pruritus (itching) may require switching to a different opioid. Constipation occurs in almost all patients on opioids, and laxatives (lactulose, macrogol-containing or co-danthramer) are typically co-prescribed.^[14]

When used appropriately, opioids and other central analgesics are otherwise safe and effective, however risks such as addiction and the body's becoming used to the drug (tolerance) can occur. The effect of tolerance means that frequent use of the drug may result in its diminished effect so, when safe to do so, the dosage may need to be increased to maintain effectiveness. This may be of particular concern regarding patients suffering with chronic pain.^{[citation needed]} Opioid tolerance is often addressed with "opioid rotation therapy" in which a patient is routinely switched between two or more non-cross-tolerant opioid medications in order to prevent exceeding safe dosages in the attempt to achieve an adequate analgesic effect.

Alcohol

Describing the effects of using alcohol to treat pain is difficult.^[15] Alcohol has biological, mental, and social effects which influence the consequences of using alcohol for pain.^[15] Moderate use of alcohol can lessen certain types of pain in certain circumstances.^[15] Attempting to use alcohol to treat pain has also been observed to lead to negative outcomes including excessive drinking and alcohol use disorder.^[15]

Medical cannabis

Medical cannabis or medical marijuana, can refer to the use of cannabis and its cannabinoids to treat disease or improve symptoms.^[16]^[17] There is limited evidence suggesting cannabis can be used to treat chronic pain and muscle spasms.^[18]^[19]^[20]

Combinations

Analgesics are frequently used in combination, such as the paracetamol and codeine preparations found in many non-prescription pain relievers. They can also be found in combination with vasoconstrictor drugs such as pseudoephedrine for sinus-related preparations, or with antihistamine drugs for allergy sufferers.

While the use of paracetamol, aspirin, ibuprofen, naproxen, and other NSAIDS concurrently with weak to mid-range opiates (up to about the hydrocodone level) has been said to show beneficial synergistic effects by combatting pain at multiple sites of action,^[21] several combination analgesic products have been shown to have few efficacy benefits when compared to similar doses of their individual components. Moreover, these combination analgesics can often result in significant adverse events, including accidental overdoses, most often due to confusion that arises from the multiple (and often non-acting) components of these combinations.^[22]

Alternative medicine

Many people use alternative medicine treatments including drugs for pain relief.^[23] There is some evidence that some treatments using alternative medicine can relieve some types of pain more effectively than placebo.^[24] The available research concludes that more research would be necessary to better understand the use of alternative medicine.^[24]

Psychotropic agents

Other psychotropic analgesic agents include ketamine (an NMDA receptor antagonist), clonidine and other α₂-adrenoreceptor agonists, and mexiletine and other local anaesthetic analogues.

Other drugs

Drugs that have been introduced for uses other than analgesics are also used in pain management. Both first-generation (such as amitriptyline) and newer anti-depressants (such as duloxetine) are used alongside NSAIDs and opioids for pain involving nerve damage and similar problems. Other agents directly potentiate the effects of analgesics, such as using hydroxyzine, promethazine, carisoprodol, or tripelennamine to increase the pain-killing ability of a given dose of opioid analgesic.

Adjuvant analgesics, also called atypical analgesics, include nefopam, orphenadrine, pregabalin, gabapentin, cyclobenzaprine, scopolamine, and other drugs possessing anticonvulsant, anticholinergic, and/or antispasmodic properties, as well as many other drugs with CNS actions. These drugs are used along with analgesics to modulate and/or modify the action of opioids when used against pain, especially of neuropathic origin.

Dextromethorphan has been noted to slow the development of tolerance to opioids and exert additional analgesia by acting upon the NMDA receptors;^{[citation needed]} some analgesics such as methadone and ketobemidone and perhaps piritramide have intrinsic NMDA action.^{[citation needed]}

High-alcohol liquor, two forms of which found in the US Pharmacopoeia up until 1916 and in common use by physicians well into the 1930s, has been used in the past as an agent for dulling pain, due to the CNS depressant effects of ethyl alcohol, a notable example being the American Civil War.^{[citation needed]} However, the ability of alcohol to relieve severe pain is likely inferior to many analgesics used today (e.g., morphine, codeine). As such, in general, the idea of alcohol for analgesia is considered a primitive practice in virtually all industrialized countries today.

The use of adjuvant analgesics is an important and growing part of the pain-control field and new discoveries are made practically every year. Many of these drugs combat the side-effects of opioid analgesics, an added bonus. For example, antihistamines including orphenadrine combat the release of histamine caused by many opioids. Stimulants such as methylphenidate, caffeine, ephedrine, dextroamphetamine, methamphetamine, and cocaine work against heavy sedation and may elevate mood in distressed patients as do the antidepressants.^{[citation needed]} The use of medicinal cannabis remains a debated issue.

In patients with chronic or neuropathic pain, various other substances may have analgesic properties. Tricyclic antidepressants, especially clomipramine and amitriptyline, have been shown to improve pain in what appears to be a central manner.^{[citation needed]} Nefopam is used in Europe for pain relief with concurrent opioids. The exact mechanism of carbamazepine, gabapentin, and pregabalin is similarly unclear, but these anticonvulsants are used to treat neuropathic pain with differing degrees of success. Anticonvulsants are most commonly used for neuropathic pain as their mechanism of action tends to inhibit pain sensation.^[25]

Flupirtine is a centrally acting K+ channel opener with weak NMDA antagonist properties.^[26] It is used in Europe for moderate to strong pain and migraine and its muscle-relaxant properties. It has no anticholinergic properties and is believed to be devoid of any activity on dopamine, serotonin, or histamine receptors. It is not addictive, and tolerance usually does not develop.^[27] However, tolerance may develop in single cases.^[28]

Other classification systems

Topical analgesia is generally recommended to avoid systemic side-effects. Painful joints, for example, may be treated with an ibuprofen- or diclofenac-containing gel (The labeling for topical diclofenac has been updated to warn about drug-induced hepatotoxicity.^[29]); capsaicin also is used topically. Lidocaine, an anesthetic, and steroids may be injected into painful joints for longer-term pain relief. Lidocaine is also used for painful mouth sores and to numb areas for dental work and minor medical procedures. In February 2007 the FDA notified consumers and healthcare professionals of the potential hazards of topical anesthetics entering the blood stream when applied in large doses to the skin without medical supervision. These topical anesthetics contain anesthetic drugs such as lidocaine, tetracaine, benzocaine, and prilocaine in a cream, ointment, or gel.^[30]

List of drugs with comparison

Comparison of different analgesics
Generic name (INN)	Physicochemistry^[31]	Mechanism of action^[32]	Routes of administration ^[32]^[33]^[34]	Pharmacokinetics^[31]	Indications ^[32]^[33]^[34]	Major safety concerns ^[32]^[33]^[34]
Non-steroidal anti-inflammatory agents
Unselective agents
Aceclofenac	Comes in betadex salt and free acid forms; practically insoluble in water, soluble in many organic solvents; degrades on contact with light; phenylacetic acid derivative.	As per diclofenac.	PO.	Protein binding > 99%; half-life = 4 hours; metabolised to diclofenac (minor); excretion = urine (67%).	As per diclofenac.	As per diclofenac.
Acemetacin	Comes in free form; practically insoluble in water, soluble in certain organic solvents; degrades upon contact with light. Chemically related to indometacin	As per diclofenac.	PO.	Slightly metabolised to indometacin.	Rheumatoid arthritis, osteoarthritis and lower back pain.	As per diclofenac.
Amfenac	No available data.	As per diclofenac.	PO.	No data.	Pain and inflammation.	As diclofenac.
Aminophenazone	Related to phenylbutazone.	As per diclofenac.	PO.	Not available.	Musculoskeletal and joint disorders.	Agranulocytosis and cancer.
Ampiroxicam	Related to piroxicam.	As per diclofenac.	PO.	No data.	Rheumatoid arthritis and osteoarthritis.	Photosensitivity and other AEs typical of NSAIDs.
Amtolmetin guacil	Prodrug to tolmetin.	As per diclofenac.	PO.	No data.	As per diclofenac.	As per diclofenac.
Aspirin	Comes in free form, aluminium and lysine salt forms; fairly insoluble in water (1 in 300); highly soluble (1 in 5) in alcohol; degrades on contact with air. Salicylate.	Irreversibly inhibits COX-1 and COX-2; hence inhibiting prostaglandin synthesis.	PO, IM, IV, rectal	Bioavailability = 80–100%; protein binding = 25–95% (inversely dependent on plasma concentration); half life = 2–3 hours, 15–30 hours (higher doses); excretion = 80–100%.^[35]	Blood thining; mild-to-moderate pain; fever; rheumatic fever; migraine; rheumatoid arthritis; Kawasaki's disease	GI bleeds; ulcers; Reye syndrome; nephrotoxicity; blood dyscrasias (rarely); Stevens-Johnson syndrome (uncommon/rare)
Azapropazone	Comes in free form; fairly insoluble in water and chloroform, soluble in ethanol; phenylbutazone.	As per diclofenac.	PO, rectal.	No data available.	Rheumatoid arthritis; gout; ankylosing spondylitis.	As per diclofenac.
Bendazac	Comes in free acid and lysine salt forms. Chemically related to indometacin.	As per acetametacin.	Topical, ophthalmologic.	N/A	Skin conditions (such as contact dermatitis) and cataracts.	Hepatotoxicity reported.
Benorilate	Aspirin-paracetamol ester. Practically insoluble in water, sparingly soluble in ethanol and methanol, soluble in acetone and chloroform.	As per aspirin and paracetamol.	PO.	Unavailable.	Osteoarthritis; rheumatoid arthritis; soft-tissue rheumatism; mild-moderate pain and fever.	As per aspirin and paracetamol.
Benzydamine	Comes in free acid form; freely soluble in water.	As per diclofenac.	Topical, PO, rectal, spray and vaginal.	No data available.	Musculoskeletal disorders; soft-tissue disorders; sore throat.	As per diclofenac.
Bromfenac	Comes in free acid form; phenylacetic acid derivative.	Reversible COX-1/COX-2 inhibitor.	Ophthalmologic.	N/A	Postoperative pain and inflammation.	Corneal ulceration.
Bufexamac	Comes in free acid form; practically insoluble in water, soluble in a few organic solvents; degrades upon contact with light.	Reversible COX-1/COX-2 inhibition.	Topical.	No data.	Skin disorders.	Skin conditions, such as contact dermatitis.
Carbasalate	Comes in calcium salt form; fairly soluble in water.	Is metabolised to aspirin and urea. As per aspirin.	Oral.	No data.	Used for thromboembolic disorders.	As per diclofenac.
Clonixin	Comes in free acid and lysine salt forms.	Reversible COX-1/COX-2 inhibition.	PO, IM, IV, rectal.	No data.	Pain.	As per diclofenac.
Dexibuprofen	D-isomer of ibuprofen. Propionic acid derivative.	As per diclofenac.	PO.	Bioavailability = ?; protein binding = 99%; metabolism = hepatic via carboxylation and hydroxylation; half-life = 1.8–3.5 hours; excretion = Urine (90%).^[36]	Osteoarthritis; mild-moderate pain and menstrual pain.^[37]	As per diclofenac.
Diclofenac	Comes in sodium, potassium and diethylamine (topically used as a gel) salt forms; sparingly soluble in water but soluble in ethanol. Unstable in the presence of light and air. Indole acetic acid derivative.	Reversible COX-1/COX-2 inhibitor.	PO and topical.	Bioavailability = 50–60%; protein binding = 99–99.8%; hepatic metabolism; half-life = 1.2–2 hours; excretion = urine (50–70%), faeces (30–35%)	Rheumatoid arthritis; osteoarthritis; inflammatory pain (e.g. period pain); local pain/inflammation (as a gel); actinic keratoses; heavy menstrual bleeding	As per aspirin, except without Reye syndrome and with the following additions: myocardial infarctions, strokes and hypertension. More prone to causing these AEs compared to the other non-selective NSAIDs.^[38]
Diethylamine salicylate	Freely soluble in water; degrades upon contact with light and iron.	As per diclofenac.	Topical.	N/A.	Rheumatic and musculoskeletal pain.	As per bufexamac.
Diflunisal	Comes in free acid and arginine salt forms; practically insoluble in water, soluble in ethanol; degrades upon contact with light.	As per diclofenac.	PO, IM, IV.	Bioavailability = 80–100%; protein binding > 99%; volume of distribution = 0.11 L/kg; hepatic metabolism; half-life = 8–12 hours; excretion = urine (90%), faeces (<5%).^[31]^[39]	Pain; osteoarthritis; rheumatoid arthritis.	As per diclofenac.
Epirizole	Comes in free form.	As per diclofenac.	PO.	Not available.	Rheumatoid arthritis.	As per diclofenac.
Ethenzamide	Comes in free form; salicylate.	As per diclofenac.	PO.	Not available.	Musculoskeletal pain; fever.	As per diclofenac.
Etofenamate	Liquid; practically insoluble in water, miscible with ethyl acetate and methanol.	As per diclofenac.	Topical.	Not available.	Musculoskeletal, joint and soft-tissue disorders.	As per bufexamac.
Felbinac	Comes in free and diisopropanolamine salt forms; practically insoluble in water and ethanol, soluble in methanol.	As per diclofenac.	Topical.	N/A	Musculoskeletal pain and soft tissue injuries.	As per bufexamac.
Fenbufen	Comes as free acid; fairly insoluble in most solvents (including water); propionic acid derivative.	As per diclofenac.	PO.	Protein binding > 99%; half-life = 10–17 hours.	As per diclofenac.	As per diclofenac.
Fenoprofen	Comes in calcium salt; fairly insoluble in water and chloroform and fairly soluble in alcohol; sensitive to degradation by air. Propionic acid derivative.	As per diclofenac.	PO.	Bioavailability = ?; protein binding = 99%; hepatic metabolism; excretion = urine, faeces.^[40]	Pain; rheumatoid arthritis and osteoarthritis.	As per diclofenac.
Fentiazac	Comes in free form and calcium salt; acetic acid derivative.	As per diclofenac.	PO.	No data.	As per diclofenac.	As per diclofenac.
Fepradinol	Comes in free acid and hydrochloride salt forms.	As per diclofenac.	Topical.	N/A	Local inflammatory response.	As per bufexamac.
Feprazone	Comes in free acid and piperazine salt forms. Phenylbutazone.	As per diclofenac.	PO, Rectal, topical.	Not available.	As per diclofenac.	As per bufexamac (topical use) and diclofenac (PO/rectal).
Floctafenine	Comes in free acid form; anthranilic acid derivative.	As per diclofenac.	Oral.	Extensively metabolised by the liver; half-life = 8 hours; excretion = urinary and biliary.	Short-term relief from pain.	As per diclofenac.
Flufenamic acid	Comes in free acid form and aluminium salt form; anthranilic acid.	As per diclofenac.	Topical.	N/A	Soft tissue inflammation and pain.	As per bufexamac.
Flurbiprofen	Comes in sodium salt and free acid forms; fairly insoluble in water but soluble in ethanol; sensitive to degradation by air. Propionic acid derivative.	As per diclofenac.	PO, IM, IV, ophthalmologic.	Bioavailability = 96% (oral); protein binding > 99%; volume of distribution = 0.12 L/kg; excretion = urine (70%).^[41]	Ophthalmologic: Vernal keratoconjunctivitis; postoperative ocular swelling; herpetic stromal keratitis, excimer laser photorefractive keratectomy; ocular gingivitis. Systemic use: rheumatoid arthritis; osteoarthritis.^[41]	As per bromfenac (ophthalmologic) and diclofenac (PO/IM/IV).
Glucametacin	Indometacin derivative.	As per diclofenac.	PO.	Not available.	Musculoskeletal, joint, peri-articular and soft-tissue disorders.	As per diclofenac.
Ibuprofen	Comes in lysine salt and free acid forms; practically insoluble in water, but soluble in ethanol, acetone, methanol, dichloromethane and chloroform. Degrades in the presence of air. Propionic acid derivative.	As per diclofenac.	PO, IV, topical	Bioavailability = 80–100%; protein binding = 90–99%; hepatic metabolism, mostly via CYP2C9 and CYP2C19-mediated oxidation; excretion = Urine (50–60%), faeces.^[42]	Pain; fever; inflammatory illness; rheumatoid arthritis; osteoarthritis; heavy menstrual bleeding; patent ductus arteriosus.^[33]^[43]^[44]	As per diclofenac, except with lower risk of myocardial infarction, stroke and hypertension.
Imidazole salicylate	Comes in free form. Salicylate.	As per diclofenac.	PO, rectal, topical.	Not available.	Muscular and rheumatic pain.	As per bufexamac (topical use) and diclofenac (PO/rectal).
Indometacin	Comes in free acid and sodium salt forms; practically insoluble in water and most solvents; sensitive to degradation by light. Acetic acid derivative.	As per diclofenac.	PO, IV, rectal	Bioavailability = 100% (oral); protein binding = 90%; hepatic metabolism; excretion = urine (60%), faeces (33%).^[45]	Rheumatoid arthritis; osteoarthritis; gout; ankylosing spondylitis; period pain; patent ductus arteriosus.^[33]	As per diclofenac.
Isonixin	Comes in free form.	As per diclofenac.	PO, rectal and topical.	Not available.	Musculoskeletal and joint disorders.	As per bufexamac (topical use) and diclofenac (PO/rectal).
Kebuzone	Comes in free and sodium salt form; phenylbutazone derivative.	As per diclofenac.	IM, PO.	Not available.	As per diclofenac.	As per diclofenac.
Ketoprofen	Comes in free acid, lysine salt, sodium salt and hydrochloride salt forms; the dex-enantiomer comes in trometamol salt form. Practically insoluble in water; freely soluble in most other solvents. Propionic acid derivative.	As per diclofenac.	PO, rectal, topical, transdermal, intravenous, intramuscular.^[46]^[47]	Bioavailability > 92% (oral), 70–90% (rectal); protein binding > 99%; volume of distribution = 0.1–0.2 L/kg; hepatic metabolism; half-life = 1.5–2 hours (oral), 2.2 hours (rectal), 2 hours (intravenous).^[48]^[49]	Rheumatoid arthritis, osteoarthritis and superficial sporting injuries (topical use).^[33]^[50]	As per diclofenac.
Ketorolac	Comes in the trometamol salt form; highly soluble in water. Degrades in the presence of light. Acetic acid derivative.	As per diclofenac.	PO, IM, IV, intranasal, tromethamine and ophthalmologic.	Bioavailability of IM formulation = 100%; protein binding = 99%; hepatic metabolism mostly via glucoronic acid conjugation and p-hydroxylation; half-life = 5–6 hours; excretion = urine (91.4%), faeces (6.1%).^[51]	Mild-moderate postoperative pain; acute migraine; inflammation of the eye due to cataract surgery or allergic seasonal conjunctivitis; prevention of acute pseudophakic cystoid macular oedema.^[52]^[53]^[54]^[55]^[56]^[57]^[58]	As per diclofenac.
Lornoxicam	Hydrochloride salt form used; oxicam derivative.	As per diclofenac.	PO.	Protein binding = 99%; volume of distribution = 0.2 L/kg; half-life = 3–5 hours; excretion = faeces (51%), urine (42%).^[59]^[60]	Acute and chronic pain.	As per diclofenac.
Loxoprofen	Comes in sodium salt form. Propionic acid derivative.	As per diclofenac.	Topical.	N/A	Local inflammation and pain.	As per diclofenac.
Magnesium salicylate	Comes in free form; soluble in water and ethanol; salicylate.	As per diclofenac.	PO.	Not available.	As per diclofenac.	As per diclofenac.
Meclofenamic acid	Comes in free acid and sodium salt form, sodium salt is the form used in human medicine; practically insoluble in water (free acid) and freely soluble in water (sodium salt); sensitive to degradation by air and light.	As per diclofenac.	PO.	Protein binding > 99%; half-life = 2–4 hours; hepatically metabolised via oxidation, hydroxylation, dehalogenation and conjugation with glucuronic acid; excretion = urine, faeces (20–30%).^[31]	Osteoarthritis; rheumatoid arthritis; mild-moderate pain; dysmenorrhoea; menorrhagia.	As per diclofenac.
Mefenamic acid	Comes in free acid form; practically insoluble in water, fairly insoluble in organic solvents; degrades on contact with air and light. Anthranilic acid derivative.	As per diclofenac.	PO.	Protein binding extensive; hepatic metabolism, mostly via CYP2C9; half-life = 2 hours; excretion = urine (66%), faeces (20–25%).^[61]	Inflammatory pain and heavy menstrual bleeding.^[33]	As per diclofenac.
Mofezolac	Comes in free form.	As per diclofenac.	PO.	Not available.	Musculoskeletal and joint pain.	As per diclofenac.
Morniflumate	Comes in free acid form; niflumic acid derivative.	As per diclofenac.	PO, rectal.	Not available.	Inflammatory conditions.	As per diclofenac.
Nabumetone	Comes in free acid form; practically insoluble in water, freely soluble in acetone; degrades on contact with air and light.	As per diclofenac.	PO.	Protein binding = 99%; hepatically metabolised; half-life = 24 hours; excretion = urine (80%), faeces (9%).^[62]	Osteoarthritis; rheumatoid arthritis.	As per diclofenac.
Naproxen	Comes in free acid and sodium form; practically insoluble in water in free form, freely soluble in water (sodium salt), fairly soluble in most organic solvents. Degrades on contact with air and light. Propionic acid derivative.	As per diclofenac.	PO.	Bioavailability = ?; protein binding > 99.5%; volume of distribution = 10% of bodyweight; half-life = 12–15 hours; excretion = urine (95%), faeces (<3%).^[63]	Rheumatoid arthritis; osteoarthritis; ankylosing spondylitis; juvenile idiopathic arthritis; inflammatory pain; heavy menstrual bleeding.	As per diclofenac. less prone to causing thrombotic events compared to other non-selective NSAIDs.^[38]
Nepafenac	Comes in free form; related to amfenac.	As per diclofenac.	Ophthalmologic.	Unavailable.	Inflammation and pain following cataract surgery.	As per bromfenac.
Niflumic acid	Comes in free acid form, glycinamide and ethyl ester form; practically insoluble in water, soluble in ethanol, acetone and methanol. Nicotinic acid derivative.	As per diclofenac.	PO, rectal (ethyl ester, morniflumate).	Unavailable.	Musculoskeletal, joint and mouth inflammatory disorders.	As per diclofenac.
Oxaprozin	Comes in potassium and free acid forms; degrades upon contact with light. Propionic acid derivative.	As per diclofenac.	PO.	Bioavailability = ?; protein binding > 99.5%; volume of distribution = 0.15–0.25 L/kg; half-life = 50–60 hours; excretion = urine (65), faeces (35%).^[64]^[65]	Osteoarthritis; rheumatoid arthritis.	As per diclofenac.
Oxyphenbutazone	Comes in free form. Phenylbutazone.	As per diclofenac.	PO, Ophthalmologic.	Unavailable.	Ophthalmologic: Episcleritis. Systemic (now seldom used due to adverse effects): ankylosing spondylitis; rheumatoid arthritis; osteoarthritis.	As per bromfenac. For systemic use haematological side effects such as aplastic anaemia; agranulocytosis; leucopenia; neutropenia; etc.
Phenazone	No data.	As per diclofenac.	PO, otolaryngologic.	Protein binding < 10%; half-life = 12 hours; hepatic metabolised; excretion = urine (primary), faeces.	Acute otitis media.	Nephrotoxicity and haematologic toxicity and other AEs typical of NSAIDs.
Phenylbutazone	Comes in free form; practically insoluble in water, freely soluble in most organic solvents; degrades upon contact with light and air.	As per diclofenac.	PO, rectal, topical.	No data available.	Ankylosing spondylitis; acute gout; osteoarthritis; rheumatoid arthritis.	Haematologic toxicity (including agranulocytosis, aplastic anaemia) and AEs typical of NSAIDs.
Piketoprofen	Comes in free form.	As per diclofenac.	Topical.	N/A.	Musculoskeletal, joint, peri-articular and soft-tissue disorders.	As per other topical NSAIDs.
Piroxicam	Comes in free acid and betadex salt forms; practically insoluble in water, slightly soluble in ethanol; degrades on contact with air and light. Enolic acid derivative.	As per diclofenac.	PO, topical.	Protein binding = 99%; extensively hepatically metabolised; half-life = 36–45 hours; excretion = urine, faeces.^[66]^[67]	Rheumatoid arthritis, osteoarthritis, ankylosing spondylitis and sports injuries (topical use).^[33]	As per diclofenac.
Proglumetacin	Comes in maleate salt form; indometacin derivative.	As per diclofenac.	PO, rectal, topical.	Not available.	Musculoskeletal and joint disorders.	As per diclofenac.
Proquazone	Comes in free form.	As per diclofenac.	PO, rectal.	Not available.	As per diclofenac.	As per diclofenac.
Pranoprofen	No data.	As per diclofenac.	PO, ophthalmologic.	Not available.	Pain, inflammation and fever.	As per diclofenac.
Salamidacetic acid	Comes in sodium and diethylamine salt forms; salicylate.	As per diclofenac.	PO.	Unavailable.	Musculoskeletal disorders.	As per diclofenac.
Salicylamide	Fairly insoluble in water and chloroform; soluble in most other organic solvents; salicylate.	As per diclofenac.	PO, topical.	No data.	Muscular and rheumatic diseases.	As per diclofenac.
Salol	No data.	As per diclofenac.	PO, topical.	No data.	Lower urinary tract infections.	As per diclofenac.
Salsalate	Degrades upon contact with air; salicylate derivative.	As per diclofenac.	PO.	Hepatic metabolism; half-life = 7–8 hours; excretion = urine.^[68]	Rheumatoid arthritis, osteoarthritis.	As per diclofenac.
Sodium salicylate	Freely soluble in water; degrades upon contact with air and light; salicylate.	As per diclofenac.	PO, IV, topical.	No data.	Pain, fever and rheumatic conditions.	Cardiac problems; otherwise As per diclofenac.
Sulindac	Comes in free acid and sodium salt forms; practically insoluble in water and hexane, very slightly soluble in most organic solvents. Degrades upon contact with light. Acetic acid derivative.	As per diclofenac.	PO, rectal.	Bioavailability = 90%; protein binding = 93% (sulindac), 98% (active metabolite); hepatic metabolism; excretion = urine (50%), faeces (25%).^[69]	Rheumatoid arthritis; osteoarthritis; gout; ankylosing spondylitis; inflammatory pain.^[33]	As per diclofenac.
Suxibuzone	Practically insoluble in water, soluble in ethanol and acetone; phenylbutazone.	As per diclofenac.	PO, topical.	No data.	Musculoskeletal and joint disorders.	As per phenylbutazone.
Tenoxicam	Comes as free acid; practically insoluble in water, fairly insoluble in organic solvents; degrades upon contact with light.	As per diclofenac.	PO, rectal.	Bioavailability = 100% (oral), 80% (rectal); protein binding = 99%; volume of distribution = 0.15 L/kg; half-life = 60–75 hours; excretion = urine (67%), faeces (33%).^[70]	Osteoarthritis; rheumatoid arthritis; soft tissue injury.	As per diclofenac.
Tetridamine	No data.	As per diclofenac.	Vaginal.	No data.	Vaginitis.	As per diclofenac.
Tiaprofenic acid	Comes as free acid; practically insoluble in water but freely soluble in most organic solvents; propionic acid derivative; degrades upon contact with light. Propionic acid derivative.	As per diclofenac.	PO.	Protein binding > 99%; volume of distribution = 0.1–0.2 L/kg; hepatic metabolism; half-life = 2–4 hours.^[71]	Ankylosing spondylitis; osteoarthritis; rheumatoid arthritis; fibrosis; capsulitis; soft-tissue disorders.	As per diclofenac.
Tiaramide	No data.	As per diclofenac.	PO.	No data.	Pain; inflammation.	As per diclofenac.
Tinoridine	No data.	As per diclofenac.	No data.	No data.	Pain; inflammation.	As per diclofenac.
Tolfenamic acid	Comes as free acid; practically insoluble in water; degrades upon contact with light; anthranilic acid.	As per diclofenac.	PO.	Protein binding = 99%; half-life = 2 hours; hepatically metabolised; excretion = urine (90%), faeces.	Migraine; osteoarthritis; rheumatoid arthritis; dysmenorrhoea.	As per diclofenac.
Tolmetin	Comes in sodium salt form; freely soluble in water, slightly soluble in ethanol, freely soluble in methanol. Acetic acid derivative.	As per diclofenac.	PO.	Protein binding > 99%; volume of distribution = 7–10 L; half-life = 1 hour; excretion = urine (90%).^[72]	Osteoarthritis; rheumatoid arthritis.	As per diclofenac.
Ufenamate	No data.	No data.	Topical.	No data.	Inflammatory skin disorders.	As per other topical NSAIDs.
COX-2 selective inhibitors
Celecoxib	Comes in free form; practically insoluble in water, fairly soluble in organic solvents. Degrades on contact with light and moisture. Sulfonamide.	Selective COX-2 inhibitor.	PO.	Protein binding = 97%; hepatic metabolism, mostly via CYP2C9; faeces (57%), urine (27%).^[73]	Rheumatoid arthritis; osteoarthritis; ankylosing spondylitis; pain due to dysmenorrhoea or injury.	As per non-selective NSAIDs. More prone to causing thrombotic events than most of them, however, except diclofenac.
Etodolac	Comes in free form; practically insoluble in water, freely soluble in acetone and dehydrated alcohol. Acetic acid derivative.	As per diclofenac.	PO.	Bioavailability = ?; protein binding > 99%; volume of distribution = 0.41 L/kg; half-life = 6–7 hours; excretion = urine (73%).^[74]^[75]^[76]	Rheumatoid arthritis, including juvenile idiopathic arthritis; osteoarthritis; acute pain.	As per diclofenac.
Etoricoxib	Comes in free form; sulfonamide.	As per diclofenac.	PO.	Bioavailability = 100%; protein binding = 91.4%; volume of distribution = 120 L; half-life = 22 hours; hepatic metabolism; excretion = urine (70%), faeces (20%).^[77]	Acute pain; gout; osteoarthritis.	As per diclofenac.
Lumiracoxib†	Comes in free form; acetic acid derivative.	As per diclofenac.	PO.	Bioavailability = 74%; protein binding > 98%; extensive hepatic metabolism, mostly via CYP2C9; half-life = 3–6 hours; excretion = Urine (50%), faeces (50%).^[78]	Osteoarthritis.	As above, plus hepatotoxicity.
Meloxicam	Comes in free form; fairly insoluble in water and in most organic solvents; oxicam derivative.	As per diclofenac.	PO, rectal.	Bioavailability = 89%; protein binding > 99%; volume of distribution = 0.1–0.2 L/kg; half-life = 22–24 hours; extensive hepatic metabolism; excretion = urine (45%), faeces (47%).^[79]	Osteoarthritis; rheumatoid arthritis.	As per diclofenac.
Nimesulide	Comes in free and betadex form; practically insoluble in water and ethanol, soluble in acetone.	As per diclofenac.	PO, rectal, topical.	Unavailable.	Acute pain; dysmenorrhoea; sprains (topical); tendinitis.	As per diclofenac.
Parecoxib	Comes in sodium salt form; sulfonamide.	As per diclofenac.	IM, IV.	Plasma binding = 98%; volume of distribution = 55 L; hepatic metabolism, mostly via CYP2C9, CYP3A4; half-life = 8 hours; excretion = urine (70%).^[80]	Postoperative pain.	As per diclofenac.
Rofecoxib†	Comes in free form; sulfonamide.	As per diclofenac.	PO.	Bioavailability = 93%; protein binding = 87%; hepatic metabolism; half-life = 17 hours.^[81]^[82]	Acute pain; osteoarthritis; rheumatoid arthritis.	As per diclofenac.
Valdecoxib†	Comes in free form; sulfonamide.	As per diclofenac.	PO.	Bioavailability = 83%; protein binding = 98%; hepatic metabolism, mostly via CYP3A4 and CYP2C9; half-life = 8.11 hours; excretion = urine (90%).^[83]	Pain from dysmenorrhoea; rheumatoid arthritis; osteoarthritis.	As above and also potentially fatal skin reactions (e.g. toxic epidermal necrolysis).
Opioids
Those with a morphine skeleton
Buprenorphine	Comes in free and hydrochloride salt forms; fairly insoluble in water, soluble in ethanol, methanol and acetone; degrades upon contact with light.	Partial agonist at the mu opioid receptor; agonist at delta opioid receptor; antagonist at kappa opioid receptor.	Sublingual, transdermal, IM, IV, intranasal, epidural, SC.	Bioavailability = 79% (sublingual); protein binding = 96%: volume of distribution = 97–187 L/kg; half-life = 20–36 hours; excretion = urine, faeces.^[84]	Opioid dependence, moderate-severe pain.	As per codeine, respiratory effects are subject to a ceiling effect.
Codeine	Comes in free form, hydrochloride salt, sulfate salt and phosphate salts; soluble in boiling water (free form), freely soluble in ethanol (free form), soluble/freely soluble in water (salt forms); sensitive to degradation by light. Methoxy analogue of morphine.	Metabolised to morphine, which activates the opioid receptors.	PO, IM, IV.	Extensive hepatic metabolism, mostly via CYP2D6, to morphine; half-life = 3–4 hours; excretion = urine (86%).^[85]	Mild-moderate pain, often in combination with paracetamol or ibuprofen.	Constipation, dependence, sedation, itching, nausea, vomiting and respiratory depression.
Diamorphine	Comes in hydrochloride salt form; freely soluble in water, soluble in alcohol; degrades upon contact with light. Diacetyl derivative of morphine.	Rapidly hydrolysed to 6-acetylmorphine and then to morphine after crossing the blood-brain barrier which in turn activates the opioid receptors in the CNS.	IM, intrathecal, intranasal, PO, IV, SC.	Extensively metabolised to morphine with 6-acetylmorphine as a possible intermediate. Mostly excreted in urine.	Severe pain (including labour pain); cough due to terminal lung cancer; angina; left ventricular failure.	As per codeine. Higher potential for abuse compared to other opioids due to its rapid penetration of the blood-brain barrier.
Dihydrocodeine	Comes in freebase, hydrochloride, phosphate, polistirex, thiocyanate, tartrate, bitartrate and hydrogen tartrate salt forms; freely soluble in water, practically insoluble in organic solvents (hydrogen tartrate salt); degrades upon contact with air and light.	Opioid receptor agonist.	IM, IV, PO, SC.	Bioavailability = 20%; extensive hepatic metabolism, partly via CYP2D6 to dihydromorphine and CYP3A4 to nordihydrocodeine; half-life = 3.5 –5 hours; excretion = urine.	Moderate-severe pain; usually in combination with paracetamol and/or aspirin.	As per codeine.
Ethylmorphine	Comes in freebase, hydrochloride, camphorate and camsilate salt forms; soluble in water and alcohol; degrades upon contact with light.	Opioid receptor ligand.	PO.	No data.	Cough suppressant.	As per codeine.
Hydrocodone	Comes in hydrochloride/tartrate salt form; freely soluble in water, practically insoluble in most organic solvents; degrades upon contact with light/air.	Opioid receptor ligand.	PO.	Protein binding = 19%; extensively hepatically metabolised, mostly via CYP3A4, but via CYP2D6 to a lesser extent to hydromorphone; half-life = 8 hours; excretion = urine.^[86]	Chronic pain.	As per codeine.
Hydromorphone	Comes in hydrochloride salt form; freely soluble in water, fairly insoluble in organic solvents; degrades upon contact with light or temperatures outside 15 °C and 35 °C.	Opioid receptor agonist.	IM, IV, PO, SC.	Bioavailability = 50–62% (oral); protein binding = 8–19%; extensively hepatically metabolised; half-life = 2–3 hours; excretion = urine.^[87]	Moderate-severe pain; cough.	As per codeine.
Morphine	Comes in freebase form, hydrochloride salt, sulfate salt and tartrate salt forms; soluble in water; degrades in the presence of light.	Opioid receptor agonist (μ, δ, κ).	IM, intrathecal, PO, IV, SC, rectal.	Protein binding = 35%; extensive hepatic metabolism, with some metabolism occur in the gut after oral administration; half-life = 2 hours; excretion = urine (90%).	Moderate-severe pain.	As per codeine.
Nicomorphine	Dinicotinic acid ester derivative of morphine.	As per morphine.	IM, IV, PO, rectal, SC.	No available data.	Moderate-severe pain.	As per codeine.
Oxycodone	Comes in freebase, hydrochloride and terephthalate salt forms; freely soluble in water and practically insoluble in organic solvents; degrades upon contact with air.	Opioid receptor agonist.	PO.	Bioavailability = 60–87%; protein binding = 45%; volume of distribution = 2.6 L/kg; extensively metabolised in the liver via CYP3A4 and to a lesser extent via CYP2D6 to oxymorphone; half-life = 2–4 hours; excretion = urine (83%).^[88]	Moderate-severe pain.	As per codeine.
Oxymorphone	Comes in hydrochloride salt form; fairly soluble in water (1 in 4), practically insoluble in most organic solvents; degrades upon contact with air, light and temperatures outside 15 °C to 30 °C.	As per morphine.	PO, IM, SC.	Bioavailability = 10% (oral); protein binding = 10–12%; volume of distribution = 1.94–4.22 L/kg; hepatic metabolism; half-life = 7–9 hours, 9–11 hours (XR); excretion = urine, faeces.^[89]	Postoperative analgesia/anaesthesia; moderate-severe pain.	As per codeine.
Morphinans
Butorphanol	Comes in tartrate salt form; sparingly soluble in water, insoluble in most organic solvents; degrades upon contact with air and at temperatures outside the range of 15 °C and 30 °C.	Kappa opioid receptor agonist; mu opioid receptor partial agonist.	IM, IV, intranasal.	Bioavailability = 60–70% (intranasal); protein binding = 80%; volume of distribution = 487 L; hepatic metabolism, mostly via hydroxylation; excretion = urine (mostly); half-life = 4.6 hours.^[90]	Moderate-severe pain, including labour pain.	As above, but with a higher propensity for causing hallucinations and delusions. Respiratory depression is subject to ceiling effect.
Levorphanol	Comes in tartrate salt form; fairly insoluble in water (1 in 50) and fairly insoluble in ethanol, chloroform and ether; unstable outside of 15 °C and 30 °C; phenanthrene derivative.	Mu opioid; NMDA antagonist; SNRI.^[91]	PO, IM, IV, SC.	Protein binding = 40%; extensive first-pass metabolism; half-life = 12–16 hours, 30 hours (repeated dosing).^[91]^[92]	Acute/chronic pain.	As per codeine.
Nalbuphine	Comes primarily as its hydrochloride salt.	Full agonist at kappa opioid receptors, partial agonist/antagonist at the mu opioid receptors.^[31]	IM, IV, SC.	Protein binding = not significant; hepatic metabolism; half-life = 5 hours; excretion = urine, faeces.^[93]^[94]	Pain; anaesthesia supplement; opioid-induced pruritus.	As per codeine. Respiratory depression is subject to ceiling effect.
Benzomorphans
Dezocine	No data available.	Mixed opioid agonist-antagonist.	IM, IV.	Volume of distribution = 9–12 L/kg; half-life = 2.2–2.7 hours.	Moderate-severe pain.	As per codeine.
Eptazocine	Comes as hydrobromide salt.	As per morphine.	IM, SC.	No data.	Moderate-severe pain.	As per codeine.
Pentazocine	Comes in free, hydrochloride and lactate salt forms; fairly insoluble in water (1:30 or less), more soluble in ethanol and chloroform; degrades upon contact with air and light.	Kappa opioid receptor agonist; mu opioid receptor antagonist/partial agonist.	IM, IV, SC.	Bioavailability = 60–70%; protein binding = 60%; hepatic metabolism; half-life = 2–3 hours; excretion = urine (primary), faeces.^[95]^[96]	Moderate-severe pain.	As per codeine. Respiratory effects are subject to a ceiling effect.
Phenylpiperidines
Anileridine	Comes in free, hydrochloride and phosphate forms; fairly insoluble in water, soluble in ethanol, ether and chloroform; degrades upon contact with air and light.	Mu opioid receptor agonist.	IM, IV.	No data.	Moderate-severe pain.	As per codeine.
Ketobemidone	Comes in hydrochloride salt form; freely soluble in water, soluble in ethanol and fairly insoluble in dichloromethane.	Mu opioid; NMDA antagonist.	PO, IM, IV, rectal.	Bioavailability = 34% (oral), 44% (rectal); half-life = 2–3.5 hours.^[97]	Moderate-severe pain.	As per other opioids.
Pethidine	Comes in hydrochloride form; very soluble in water, sparingly soluble in ether, soluble in ethanol; degrades upon contact with air and light.	Mu opioid receptor agonist with some serotonergic effects.	IM, IV, PO, SC.	Bioavailability = 50–60%; protein binding = 65–75%; hepatic metabolism; half-life = 2.5–4 hours; excretion = urine (primarily).^[98]^[99]^[100]^[101]^[102]	Moderate-severe pain.	As per other opioids; and seizures, anxiety, mood changes and serotonin syndrome.
Open-chain opioids
Dextromoramide	Comes in tartrate salt and free forms; soluble in water (tartrate salt).	IM, IV, PO, rectal.	No data available.	Severe pain.	As per other opioids.	As per other opioids.
Dextropropoxyphene	Comes in free form, hydrochloride and napsilate salt forms; very soluble in water (HCl), practically insoluble in water (napsilate); degrades upon contact with light and air.	Mu opioid.	PO.	Protein binding = 80%; hepatic metabolism; half-life = 6–12 hours, 30–36 hours (active metabolite).	Mild-moderate pain.	As per other opioids, plus ECG changes.
Dipipanone	Comes in hydrochloride salt form; practically insoluble in water and ether, soluble in acetone and ethanol.	Mu opioid.	PO, often in combination with cyclizine.	Half-life = 20 hours.^[103]	Moderate-severe pain.	Less sedating than morphine, otherwise as per morphine.
Levacetylmethadol†	Comes in hydrochloride salt form.	As above plus nicotinic acetylcholine receptor antagonist.	PO.	Protein binding = 80%; half-life = 2.6 days.	Opioid dependence.	As per other opioids, plus ventricular rhythm disorders.
Levomethadone	Comes in hydrochloride salt form; soluble in water and alcohol; degrades upon contact with light.	Mu opioid; NMDA antagonist.	PO.	No data.	As per methadone.	As per methadone.
Meptazinol	Comes in hydrochloride salt form; soluble in water, ethanol and methanol, fairly insoluble in acetone; unstable at temperatures greater than 25 °C.	Mixed opioid agonist-antagonist, partial agonist at mu-1 receptor; cholinergic actions exist.	IM, IV, PO.	Bioavailability = 8.69% (oral); protein binding = 27.1%; half-life = 2 hours; excretion = urine.^[104]	Moderate-severe pain; perioperative analgesia; renal colic.	As per pentazocine.
Methadone	Comes in hydrochloride salt form; soluble in water and ethanol; degrades upon contact with air and light and outside the temperature range of 15 °C and 30 °C.	Mu opioid; NMDA antagonist.	IM, IV, PO, SC.	Bioavailability = 36–100% (mean: 70–80%); protein binding = 81–97% (mean: 87%); volume of distribution = 1.9-8 L/kg (mean: 4 L/kg); hepatic metabolism, mostly via CYP3A4, CYP2B6 and to a lesser extent: CYP2C9, CYP2C19, CYP2D6 & CYP2C8; half-life = 5–130 hours (mean: 20–35 hours); excretion = urine (20–50%), faeces.^[105]	Opioid addiction; chronic pain.	As per other opioids, plus QT interval prolongation.
Piritramide	Comes in free or tartrate salt forms.	Mu opioid.	IM, IV, SC.	No data available.	Severe pain.	As per other opioids.
Tapentadol	Comes in free and hydrochloride salt forms.	Mu opioid and norepinephrine reuptake inhibitor.	PO.	Bioavailability = 32%; protein binding = 20%; hepatic metabolism, mostly via CYP2C9, CYP2C19, CYP2D6; excretion = urine (70%), faeces; half-life = 4 hours.	Moderate-severe pain.	As per other opioids; less likely to cause nausea, vomiting and constipation.
Tilidine	Comes in hydrochloride salt form; soluble in water, ethanol and dichloromethane; degrades upon contact with light.	Mu opioid metabolite, nortilidine.	PO.	No data.	Moderate-severe pain.	As per other opioids.
Tramadol	Comes in hydrochloride salt form; freely soluble in water and methanol, insoluble in acetone; degrades at temperatures less than 15 °C and 30 °C and upon contact with light.	Mu opioid (mostly via its active metabolite, O-desmethyltramadol) and SNRI.	IM, IV, PO, rectal.	Bioavailability = 70–75% (oral), 100% (IM); protein binding = 20%; hepatic metabolism, via CYP3A4 and CYP2D6; half-life = 6 hours; excretion = urine, faeces.	Moderate-severe pain.	As per other opioids but with less respiratory depression and constipation. Psychiatric AEs reported. Serotonin syndrome possible if used in conjunction with other serotonergics.
Anilidopiperidines
Alfentanil	Comes in hydrochloride salt form; freely soluble in ethanol, water, methanol; degrades upon contact with air and light.	Mu opioid.	Epidural, IM, IV, intrathecally.	Protein binding = 90%; volume of distribution = small; half-life = 1–2 hours; hepatic metabolism, mostly via CYP3A4; excretion = urine.	Procedural anaesthesia.	As per other opioids. Very sedating.
Fentanyl	Comes in free, hydrochloride salt, citrate salt forms; practically insoluble in water (free form), soluble in water (citrate salt form), freely soluble in ethanol and methanol; degrades outside the temperature range of 15 °C and 30 °C and upon contact with light.	Mu opioid.	Buccal, epidermal, IM, IV, intrathecal, intranasal, SC, sublingual.	Bioavailability = 50% (buccal), 89% (intranasal); protein binding = 80%; hepatic metabolism, mostly via CYP3A4; half-life = 219 min; excretion = urine (primary), faeces.	Moderate-severe pain (including labour pain); adjunct to anaesthesia.	As with other opioids, with less nausea, vomiting, constipation and itching and more sedation.
Remifentanil	Comes in hydrochloride salt.	Mu opioid.	IV.	Protein binding = 70%; hydrolysed by blood and tissue esterases; half-life = 20 min; excretion = urine (95%).	Anaesthesia maintenance.	As with fentanyl.
Sufentanil	Comes in free and citrate salt forms; soluble in water, ethanol and methanol; degrades upon contact with light and temperatures outside 15 °C and 30 °C.	Mu opioid.	Epidural, IV, intrathecal, transdermal.	Protein binding = 90%; half-life = 2.5 hours; excretion = urine (80%).	Adjunct to anaesthesia and moderate-severe pain.	As with fentanyl.
Other analgesics
Acetanilide	No data.	Paracetamol prodrug.	PO.	No data.	Pain; fever.	Cancer; AEs of paracetamol.
Amitriptyline	Comes in free form and in hydrochloride and embonate salt forms; practically insoluble in water (embonate salt), freely soluble in water (HCl); degrades upon contact with light.	SNRI.	PO.	Hepatic metabolism, via CYP2C19, CYP3A4; active metabolite, nortriptyline; half-life = 9–27 hours; excretion = urine (18%), faeces.	Neuropathic pain; nocturnal enuresis; major depression; migraine prophylaxis; urinary urge incontinence.	Sedation, anticholinergic effects, weight gain, orthostatic hypotension, sinus tachycardia, sexual dysfunction, tremor, dizziness, sweating, agitation, insomnia, anxiety, confusion.
Dronabinol	Comes in free form; degrades upon contact with light.	Cannabinoid receptor partial agonist.	PO.	Bioavailability = 10–20%; protein binding = 90–99%; volume of distribution = 10 L/kg; hepatic metabolism; half-life = 25–36 hours, 44–59 hours (metabolites); excretion = faeces (50%), urine (15%).^[106]	Refractory chemotherapy-induced nausea and vomiting; anorexia; neuropathic pain.	Dizziness, euphoria, paranoia, somnolence, abnormal thinking, abdominal pain, nausea, vomiting, depression, hallucinations, hypotension, special difficulties, emotional lability, tremors, flushing, etc.
Duloxetine	Comes in hydrochloride salt form; slightly soluble in water, freely soluble in methanol; degrades upon contact with light.	SNRI.	PO.	Protein binding > 90%; volume of distribution = 3.4 L/kg; hepatic metabolism, via CYP2D6, CYP1A2; half-life = 12 hours; excretion = urine (70%), faeces (20%).^[107]	Major depression; generalised anxiety disorder; neuropathic pain.	Anticholinergic effects, GI effects, yawning, sweating, dizziness, weakness, sexual dysfunction, somnolence, insomnia, headache, tremor, decreased appetite.
Flupirtine	Comes as maleate salt. Chemically related to retigabine.	Potassium channel (Kv7) opener.^[108]	PO, rectal.	Bioavailability = 90% (oral), 72.5% (rectal); protein binding = 80%; volume of distribution = 154 L; hepatic metabolism; half-life = 6.5 hours; excretion = urine (72%).	Pain; fibromyalgia; Creutzfeldt-Jakob disease.	Drowsiness, dizziness, heartburn, dry mouth, fatigue and nausea.^[109]
Gabapentin	Comes in free and enacarbil salt forms; fairly insoluble in ethanol, dichoromethane, fairly soluble in water.	Binds to the α2δ-1 subunit of voltage gated calcium ion channels in the spinal cord. May also modulate NMDA receptors and protein kinase C.	PO.	Half-life = 5–7 hours.	Neuropathic pain; epilepsy.	Fatigue, sedation, dizziness, ataxia, tremor, diplopia, nystagmus, amblyopia, amnesia, abnormal thinking, hypertension, vasodilation, peripheral oedema, dry mouth, weight gain and rash.
Milnacipran	No data.	SNRI.	PO.	Bioavailability = 85–90%; protein binding = 13%: volume of distribution = 400 L; hepatic metabolism; half-life = 6–8 hours (L-isomer), 8–10 hours (D-isomer); excretion = urine (55%).^[110]	Fibromyalgia.	As per duloxetine, plus hypertension.
Nabiximols	Contains cannabidiol and dronabinol in roughly equal concentrations.	As per dronabinol.	Buccal spray.	Not available.	Neuropathic pain and spasticity as part of MS.	As per dronabinol.
Nefopam	Comes in a hydrochloride salt form. Chemically related to orphenadrine.	Unknown; serotonin-norepinephrine-dopamine reuptake inhibitor.	PO, IM.	Protein binding = 73%; half-life = 4 hours; excretion = urine, faeces (8%).	Analgesia, especially postoperative; hiccups.	Has antimuscarinic and sympathomimetic effects.^[111]
Paracetamol	Comes in free form; practically insoluble in water, freely soluble in ethanol; degrades upon contact with moisture, air and light.	Multiple; inhibits prostaglandin synthesis in the CNS, an active metabolite, AM404, is an anandamide reuptake inhibitor.	PO, IV, IM, rectal.	Protein binding = 10–25%; volume of distribution = 1 L/kg; hepatic metabolism; half-life = 1–3 hours; excretion = urine.^[112]	Analgesia and fever reduction.	Hepatotoxicity; hypersensitivity reactions (rare), including Stevens-Johnson syndrome; hypotension (rare; IV).
Phenacetin	No data.	Prodrug to paracetamol.	PO.	No data.	Analgesia and fever reduction.	Haematologic, nephrotoxicity, cancer and paracetamol AEs.
Pregabalin	Comes in free form.	As per gabapentin.	PO.	Bioavailability = 90%; half-life = 6.3 hours; hepatic metabolism; excretion = urine (90%).^[113]	Neuropathic pain; anxiety; epilepsy.	As per gabapentin.
Propacetamol	Freely soluble in water; degrades upon contact with moisture.	Prodrug to paracetamol.	IM, IV.	No data available.	Analgesia and fever reduction.	As per paracetamol.
Ziconotide	Peptide.	N-type calcium-channel blocker.	Intrathecal.	Protein binding = 50%; half-life = 2.9–6.5 hours; excretion = urine (<1%).^[114]	Chronic pain.	CNS toxicity (abnormal gait, abnormal vision, memory problems, etc.); GI effects.^[114]
Where † indicates products that are no longer marketed.

Society and culture

Term

The word analgesic derives from Greek an- (ἀν-, "without"), álgos (ἄλγος, "pain"),^[115] and -ikos (-ικος, forming adjectives). Such drugs were usually known as anodynes before the 20th century.^[116]^[117]

Research

Some novel and investigational analgesics include subtype-selective voltage-gated sodium channel blockers such as funapide and raxatrigine, as well as multimodal agents such as ralfinamide.^{[citation needed]}

References

^ Anonymous (1990). Cancer pain relief and palliative care; report of a WHO expert committee. World Health Organization Technical Report Series, 804. Geneva, Switzerland: World Health Organization. pp. 1–75. ISBN 92-4-120804-X.
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English Journal

Influence of pro-algesic foods on chronic pain conditions.

Cairns BE1,2.
Expert review of neurotherapeutics.Expert Rev Neurother.2016 Apr;16(4):415-23. doi: 10.1586/14737175.2016.1157471. Epub 2016 Mar 7.
This paper examines current knowledge about putative "pro-algesic" dietary components, and discusses whether limiting the intake of these substances can help improve chronic pain. Although there is a common impression that numerous food components, natural and synthetic, can cause or worsen pain sym
PMID 26900907

Pathophysiological effects caused by the venom of the social wasp Synoeca surinama.

Silva Jde C1, Oliveira FN1, Moreira KG2, Mayer AB1, Freire DO1, Cherobim MD3, Gomes de Oliveira Junior N3, Schwartz CA1, Schwartz EF1, Mortari MR4.
Toxicon : official journal of the International Society on Toxinology.Toxicon.2016 Apr;113:41-8. doi: 10.1016/j.toxicon.2016.02.005. Epub 2016 Feb 5.
Envenomation by wasp stings is a public health preoccupation, and signals after stings have variable effects depending on the number of attacks and individual sensitivities. Even with the high rate of wasp sting cases, the study of phatophysiological effects of the envenomation is still very incipie
PMID 26854369

Involvement of transient receptor potential A1 channel in algesic and analgesic actions of the organic compound limonene.

Kaimoto T1, Hatakeyama Y1, Takahashi K1,2, Imagawa T3, Tominaga M4, Ohta T1,2.
European journal of pain (London, England).Eur J Pain.2016 Mar 31. doi: 10.1002/ejp.840. [Epub ahead of print]
BACKGROUND: TRPA1 is a Ca-permeable nonselective cation channel expressed in sensory neurons and acts as a nocisensor. Recent reports show that some monoterpenes, a group of naturally occurring organic compounds, modulate TRP channel activity. Here, we report that limonene, being contained in citrus
PMID 27030509

Japanese Journal

鍼灸刺激の受容器(経穴)の有力候補ポリモーダル受容器について

水村和枝
日本東洋醫學雜誌 = Japanese journal of oriental medicine 62(2), 196-205, 2011-03-20
鍼灸ではその入力系として筋無髄神経（C線維）が働いていると言われている。筋無髄神経受容器の中でも，中等度以上の機械刺激，熱刺激，発痛物質のいずれにも反応するポリモーダル受容器が鍼灸効果には重要であると考えられている。本講演では，筋ポリモーダル受容器の反応特性，特に機械刺激に対する感作について紹介する。<BR>ポリモーダル受容器は，筋C線維中の機械感受性受容器の中でラットでは約5割を占め …
NAID 10027959809

A BOLD-fMRI study of cerebral activation induced by injection of algesic chemical substances into the anesthetized rat forepaw

Asanuma Taketoshi,Yasui Hironobu,Sato Masayasu,Inanami Osamu,Kuwabara Mikinori
Japanese Journal of Veterinary Research 56(2), 99-107, 2008-08-00
… This study was performed to examine whether the brain activities induced by noxious algesic chemical substances in anesthetized animals could be detected by blood oxygen-leveldependent functional magnetic resonance imaging (BOLD-fMRI). … Furthermore, pretreatment with morphine completely abolished these responses induced by the chemical algesic substances. …
NAID 120000947264

Structural Requirement of the Acyl Group of Ac-RYYRIK-NH_2, an Antagonist of Algesic Neuropeptide Nociceptin

ISOZAKI Kaname,OKADA Kazushi,KAWANO Michiaki,HONDA Takeshi,NOSE Takeru,COSTA Tommaso,SHIMOHIGASHI Yasuyuki
Peptide science : proceedings of the ... Japanese Peptide Symposium 2003, 269-272, 2004-03-01
NAID 10012654237

「発痛」

　　[★]

英: pain generation、algesic
関: 発痛性

「発痛性」

　　[★]

英: algesic
関: 発痛

「analgesic action」

　　[★]

鎮痛作用

関: analgesic effect

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v t e Pharmacology: major drug groups

Gastrointestinal tract/ metabolism (A)	stomach acid Antacids H₂ antagonists Proton pump inhibitors Antiemetics Laxatives Antidiarrhoeals/Antipropulsives Anti-obesity drugs Anti-diabetics Vitamins Dietary minerals

Blood and blood forming organs (B)	Antithrombotics Antiplatelets Anticoagulants Thrombolytics/fibrinolytics Antihemorrhagics Platelets Coagulants Antifibrinolytics

Cardiovascular system (C)	cardiac therapy/antianginals Cardiac glycosides Antiarrhythmics Cardiac stimulants Antihypertensives Diuretics Vasodilators Beta blockers Calcium channel blockers renin-angiotensin system ACE inhibitors Angiotensin II receptor antagonists Renin inhibitors Antihyperlipidemics Statins Fibrates Bile acid sequestrants

Skin (D)	Emollients Cicatrizants Antipruritics Antipsoriatics Medicated dressings

Genitourinary system (G)	Hormonal contraception Fertility agents SERMs Sex hormones

Endocrine system (H)	Hypothalamic-pituitary hormones Corticosteroids Glucocorticoids Mineralocorticoids Sex hormones Thyroid hormones/Antithyroid agents

Infections and infestations (J, P, QI)	Antimicrobials: Antibacterials (Antimycobacterials) Antifungals Antivirals Antiparasitics Antiprotozoals Anthelmintics Ectoparasiticides IVIG Vaccines

Malignant disease (L01-L02)	Anticancer agents Antimetabolites Alkylating Spindle poisons Antineoplastic Topoisomerase inhibitors

Immune disease (L03-L04)	Immunomodulators Immunostimulants Immunosuppressants

Muscles, bones, and joints (M)	Anabolic steroids Anti-inflammatories NSAIDs Antirheumatics Corticosteroids Muscle relaxants Bisphosphonates

Brain and nervous system (N)	Analgesics Anesthetics General Local Anorectics Anti-ADHD Agents Antiaddictives Anticonvulsants Antidementia Agents Antidepressants Antimigraine Agents Antiparkinson's Agents Antipsychotics Anxiolytics Depressants Entactogens Entheogens Euphoriants Hallucinogens Psychedelics Dissociatives Deliriants Hypnotics/Sedatives Mood Stabilizers Neuroprotectives Nootropics Neurotoxins Orexigenics Serenics Stimulants Wakefulness-Promoting Agents

Respiratory system (R)	Decongestants Bronchodilators Cough medicines H₁ antagonists

Sensory organs (S)	Ophthalmologicals Otologicals

Other ATC (V)	Antidotes Contrast media Radiopharmaceuticals Dressings

リンク元	「発痛」「発痛性」
拡張検索	「analgesic action」

匿名

検索

案内

案内

algesic