of or relating to or affecting or for use in the mouth; "oral hygiene"; "an oral thermometer"; "an oral vaccine"
an examination conducted by spoken communication (同)oral exam, oral_examination, viva voce, viva
using speech rather than writing; "an oral tradition"; "an oral agreement" (同)unwritten
a stage in psychosexual development when the childs interest is concentrated in the mouth; fixation at this stage is said to result in dependence, selfishness, and aggression
of or involving the mouth or mouth region or the surface on which the mouth is located; "the oral cavity"; "the oral mucous membrane"; "the oral surface of a starfish"
Path by which a drug, fluid, poison, or other substance is taken into the body
Oral administration of a liquid
A route of administration in pharmacology and toxicology is the path by which a drug, fluid, poison, or other substance is taken into the body.[1]
Routes of administration are generally classified by the location at which the substance is applied. Common examples include oral and intravenous administration. Routes can also be classified based on where the target of action is. Action may be topical (local), enteral (system-wide effect, but delivered through the gastrointestinal tract), or parenteral (systemic action, but delivered by routes other than the GI tract). Route of administration and dosage form are aspects of drug delivery.
Contents
1Classification
1.1By application location
1.1.1Enteral/gastrointestinal
1.1.2Parenteral
1.2Topical
2Choice of routes
2.1Convenience
2.2Desired target effect
2.3Oral
2.4Local
2.5Mouth inhalation
2.6Nasal inhalation
2.7Parenteral
2.8Intranasal
2.9Sublingual
2.10Buccal
2.11Sublabial administration
3Research
4See also
5References
6External links
Classification
Routes of administration are usually classified by application location (or exposition).
The route or course the active substance takes from application location to the location where it has its target effect is usually rather a matter of pharmacokinetics (concerning the processes of uptake, distribution, and elimination of drugs). Exceptions include the transdermal or transmucosal routes, which are still commonly referred to as routes of administration.
The location of the target effect of active substances are usually rather a matter of pharmacodynamics (concerning e.g. the physiological effects of drugs[2]). An exception is topical administration, which generally means that both the application location and the effect thereof is local.[3]
Topical administration is sometimes defined as both a local application location and local pharmacodynamic effect,[3] and sometimes merely as a local application location regardless of location of the effects.[4][5]
By application location
Enteral/gastrointestinal
Administration through the gastrointestinal tract is sometimes termed enteral or enteric administration (literally meaning 'through the intestines'). Enteral/enteric administration usually includes oral[6] (through the mouth) and rectal (into the rectum)[6] administration, in the sense that these are taken up by the intestines. However, uptake of drugs administered orally may also occur already in the stomach, and as such gastrointestinal (along the gastrointestinal tract) may be a more fitting term for this route of administration. Furthermore, some application locations often classified as enteral, such as sublingual[6] (under the tongue) and sublabial or buccal (between the cheek and gums/gingiva), are taken up in the proximal part of the gastrointestinal tract without reaching the intestines. Strictly enteral administration (directly into the intestines) can be used for systemic administration, as well as local (sometimes termed topical), such as in a contrast enema, whereby contrast media is infused into the intestines for imaging. However, for the purposes of classification based on location of effects, the term enteral is reserved for substances with systemic effects.
A medical professional injects medication into a gastric tube.
Many drugs as tablets, capsules, or drops are taken orally. Administration methods directly into the stomach include those by gastric feeding tube or gastrostomy. Substances may also be placed into the small intestines, as with a duodenal feeding tube and enteral nutrition. Enteric coated tablets are designed to dissolve in the intestine, not the stomach, because the drug present in the tablet causes irritation in the stomach.
Administering medication rectally
The rectal route is an effective route of administration for many medications, especially those used at the end of life.[7][8][9][10][11][12][13] The walls of the rectum absorb many medications quickly and effectively.[14] Medications delivered to the distal one-third of the rectum at least partially avoid the "first pass effect" through the liver, which allows for greater bio-availability of many medications than that of the oral route. Rectal mucosa is highly vascularized tissue that allows for rapid and effective absorption of medications.[15] A suppository is a solid dosage form that fits for rectal administration. In hospice care, a specialized rectal catheter, designed to provide comfortable and discreet administration of ongoing medications provides a practical way to deliver and retain liquid formulations in the distal rectum, giving health practitioners a way to leverage the established benefits of rectal administration.
Parenteral
Needle insertion angles for 4 types of parenteral administration of medication: intramuscular, subcutaneous, intravenous, and intradermal injection.
The parenteral route is any route that is not enteral (par- + enteral).
Parenteral administration can be performed by injection, that is, using a needle (usually a hypodermic needle) and a syringe,[16] or by the insertion of an indwelling catheter.
Locations of application of parenteral administration include:
Central nervous system:
Epidural (synonym: peridural) (injection or infusion into the epidural space), e.g. epidural anesthesia.
Intracerebral (into the cerebrum) administration by direct injection into the brain. Used in experimental research of chemicals[17] and as a treatment for malignancies of the brain.[18] The intracerebral route can also interrupt the blood brain barrier from holding up against subsequent routes.[19]
Intracerebroventricular (into the cerebral ventricles) administration into the ventricular system of the brain. One use is as a last line of opioid treatment for terminal cancer patients with intractable cancer pain.[20]
A transdermal patch which delivers medication is applied to the skin. The patch is labelled with the time and date of administration as well as the administrator's initials.
A medical professional applies nose drops.
Epicutaneous (application onto the skin). It can be used both for local effect as in allergy testing and typical local anesthesia, as well as systemic effects when the active substance diffuses through skin in a transdermal route.
Sublingual and buccal medication administration is a way of giving someone medicine orally (by mouth). Sublingual administration is when medication is placed under the tongue to be absorbed by the body. The word "sublingual" means "under the tongue." Buccal administration involves placement of the drug between the gums and the cheek. These medications can come in the form of tablets, films, or sprays. Many drugs are designed for sublingual administration, including cardiovascular drugs, steroids, barbiturates, opioid analgesics with poor gastrointestinal bioavailability, enzymes and, increasingly, vitamins and minerals.
Extra-amniotic administration, between the endometrium and fetal membranes.
Nasal administration (through the nose) can be used for topically acting substances, as well as for insufflation of e.g. decongestant nasal sprays to be taken up along the respiratory tract. Such substances are also called inhalational, e.g. inhalational anesthetics.
Intra-arterial (into an artery), e.g. vasodilator drugs in the treatment of vasospasm and thrombolytic drugs for treatment of embolism.
Intra-articular, into a joint space. It is generally performed by joint injection. It is mainly used for symptomatic relief in osteoarthritis.
Intracardiac (into the heart), e.g. adrenaline during cardiopulmonary resuscitation (no longer commonly performed).
Intracavernous injection, an injection into the base of the penis.
Intradermal, (into the skin itself) is used for skin testing some allergens, and also for mantoux test for tuberculosis.
Intralesional (into a skin lesion), is used for local skin lesions, e.g. acne medication.
Intramuscular (into a muscle), e.g. many vaccines, antibiotics, and long-term psychoactive agents. Recreationally the colloquial term 'muscling' is used.[21]
Intraocular administration
Intraocular, into the eye, e.g., some medications for glaucoma or eye neoplasms.
Intraosseous infusion (into the bone marrow) is, in effect, an indirect intravenous access because the bone marrow drains directly into the venous system. This route is occasionally used for drugs and fluids in emergency medicine and pediatrics when intravenous access is difficult.
Intraperitoneal, (infusion or injection into the peritoneum) e.g. peritoneal dialysis.
Intrathecal (into the spinal canal) is most commonly used for spinal anesthesia and chemotherapy.
Intrauterine.
Intravaginal administration, in the vagina.
Intravenous (into a vein), e.g. many drugs, total parenteral nutrition.
Intravesical infusion is into the urinary bladder.
Intravitreal, through the eye.
Subcutaneous (under the skin).[22] This generally takes the form of subcutaneous injection, e.g. with insulin. Skin popping is a slang term that includes subcutaneous injection, and is usually used in association with recreational drugs. In addition to injection, it is also possible to slowly infuse fluids subcutaneously in the form of hypodermoclysis.
Transdermal (diffusion through the intact skin for systemic rather than topical distribution), e.g. transdermal patches such as fentanyl in pain therapy, nicotine patches for treatment of addiction and nitroglycerine for treatment of angina pectoris.
Perivascular administration (perivascular medical devices and perivascular drug delivery systems are conceived for local application around a blood vessel during open vascular surgery).[23]
Transmucosal (diffusion through a mucous membrane), e.g. insufflation (snorting) of cocaine, sublingual, i.e. under the tongue, sublabial, i.e. between the lips and gingiva, nitroglycerine, vaginal suppositories.
Topical
Main article: Topical medication
The definition of the topical route of administration sometimes states that both the application location and the pharmacodynamic effect thereof is local.[3]
In other cases, topical is defined as applied to a localized area of the body or to the surface of a body part regardless of the location of the effect.[4][5] By this definition, topical administration also includes transdermal application, where the substance is administered onto the skin but is absorbed into the body to attain systemic distribution.
If defined strictly as having local effect, the topical route of administration can also include enteral administration of medications that are poorly absorbable by the gastrointestinal tract. One poorly absorbable antibiotic is vancomycin, which is recommended by mouth as a treatment for severe Clostridium difficile colitis.[24]
Choice of routes
The reason for choice of routes of drug administration are governing by various factors:
Physical and chemical properties of the drug. The physical properties are solid, liquid and gas. The chemical properties are solubility, stability, pH, irritancy etc.
Site of desired action: the action may be localised and approachable or generalised and not approachable.
Rate of extent of absorption of the drug from different routes.
Effect of digestive juices and the first pass metabolism of drugs.
Condition of the patient.
In acute situations, in emergency medicine and intensive care medicine, drugs are most often given intravenously. This is the most reliable route, as in acutely ill patients the absorption of substances from the tissues and from the digestive tract can often be unpredictable due to altered blood flow or bowel motility.
Convenience
Enteral routes are generally the most convenient for the patient, as no punctures or sterile procedures are necessary. Enteral medications are therefore often preferred in the treatment of chronic disease. However, some drugs can not be used enterally because their absorption in the digestive tract is low or unpredictable. Transdermal administration is a comfortable alternative; there are, however, only a few drug preparations that are suitable for transdermal administration.
Desired target effect
Identical drugs can produce different results depending on the route of administration. For example, some drugs are not significantly absorbed into the bloodstream from the gastrointestinal tract and their action after enteral administration is therefore different from that after parenteral administration. This can be illustrated by the action of naloxone (Narcan), an antagonist of opiates such as morphine. Naloxone counteracts opiate action in the central nervous system when given intravenously and is therefore used in the treatment of opiate overdose. The same drug, when swallowed, acts exclusively on the bowels; it is here used to treat constipation under opiate pain therapy and does not affect the pain-reducing effect of the opiate.
Oral
Main article: Oral administration
The oral route is generally the most convenient and costs the least.[25] However, some drugs can cause gastrointestinal tract irritation.[26] For drugs that come in delayed release or time-release formulations, breaking the tablets or capsules can lead to more rapid delivery of the drug than intended.[25] The oral route is limited to formulations containing small molecules only while biopharmaceuticals (usually proteins) would be digested in the stomach and thereby become ineffective. Biopharmaceuticals have to be given by injection or infusion. However, recent research (2018) found an organic ionic liquid suitable for oral insulin delivery (a biopharmaceutical) into the blood stream.[27]
Oral administration is often denoted "PO" from "per os", the Latin for "by mouth".
The bioavailability of oral administration is affected by the amount of drug that is absorbed across the intestinal epithelium and first-pass metabolism.[28]
Local
By delivering drugs almost directly to the site of action, the risk of systemic side effects is reduced.[25]
Skin absorption (dermal absorption), for example, is to directly deliver drug to the skin and, hopefully, to the systemic circulation.[29] However, skin irritation may result, and for some forms such as creams or lotions, the dosage is difficult to control.[26] Upon contact with the skin, the drug penetrates into the dead stratum corneum and can afterwards reach the viable epidermis, the dermis, and the blood vessels.[29]
Mouth inhalation
A dummy wears a nebulizer mask, used to administer inhaled medications.
Inhaled medications can be absorbed quickly and act both locally and systemically.[26] Proper technique with inhaler devices is necessary to achieve the correct dose. Some medications can have an unpleasant taste or irritate the mouth.[26]
In general, only 20–50% of the pulmonary-delivered dose rendered in powdery particles will be deposited in the lung upon mouth inhalation.[38] The remainder of 50-70% undeposited aerosolized particles are cleared out of lung as soon as exhalation.[38]
An inhaled powdery particle that is >8 μm is structurally predisposed to depositing in the central and conducting airways (conducting zone) by inertial impaction.[38]
An inhaled powdery particle that is between 3 and 8 μm in diameter tend to largely deposit in the transitional zones of the lung by sedimentation.[38]
An inhaled powdery particle that is <3 μm in diameter is structurally predisposed to depositing primarily in the respiratory regions of the peripheral lung via diffusion.[38]
Particles that deposit in the upper and central airways are rarely absorbed systemically because they are going to be removed by mucociliary clearance in an efficient and rapid fashion.[38]
Further information: PM 2.5 and PM 10
Nasal inhalation
Inhalation by smoking a substance is likely the most rapid way to deliver drugs to the brain, as the substance travels directly to the brain without being diluted in the systemic circulation.[39] The severity of dependence on psychoactive drugs tends to increase with more rapid drug delivery.[39]
Parenteral
A peripheral IV placed on the hand.
A medical professional performs an intradermal (ID) injection.
The term injection encompasses intravenous (IV), intramuscular (IM), subcutaneous (SC) and intradermal (ID) administration.[40]
Parenteral administration generally acts more rapidly than topical or enteral administration, with onset of action often occurring in 15–30 seconds for IV, 10–20 minutes for IM and 15–30 minutes for SC.[41] They also have essentially 100% bioavailability and can be used for drugs that are poorly absorbed or ineffective when they are given orally.[25] Some medications, such as certain antipsychotics, can be administered as long-acting intramuscular injections.[42] Ongoing IV infusions can be used to deliver continuous medication or fluids.[43]
Disadvantages of injections include potential pain or discomfort for the patient and the requirement of trained staff using aseptic techniques for administration.[25] However, in some cases, patients are taught to self-inject, such as SC injection of insulin in patients with insulin-dependent diabetes mellitus. As the drug is delivered to the site of action extremely rapidly with IV injection, there is a risk of overdose if the dose has been calculated incorrectly, and there is an increased risk of side effects if the drug is administered too rapidly.[25]
Intranasal
Drug administration via the nasal cavity yields rapid drug absorption and therapeutic effects.[44] This is because drug absorption through the nasal passages doesn't go through the gut before entering capillaries situated at tissue cells and then systemic circulation and such absorption route allows transport of drugs into the central nervous system via the pathways of olfactory and trigeminal nerve.[44]
Intranasal absorption features low lipophilicity, enzymatic degradation within the nasal cavity, large molecular size, and rapid mucociliary clearance from the nasal passages, which explains the low risk of systemic exposure of the administered drug absorbed via intranasal.[44]
Involved subjects' positions.
Sublingual
Sublingual administration is fulfilled by placing the drug between the tongue and the lower surface of the mouth.[44] The sublingual mucosa is highly permeable and thereby provides access to the underlying expansive network composed of capillaries, leading to rapid drug absorption.[44]
Buccal
Buccally administered a medication is achieved by placing the drug between gums and the inner lining of the cheek.[45][44] In comparison with sublingual tissue, buccal tissue is less permeable resulting in slower absorption.[44]
Sublabial administration
Sublabial administration
Research
Neural drug delivery is the next step beyond the basic addition of growth factors to nerve guidance conduits. Drug delivery systems allow the rate of growth factor release to be regulated over time, which is critical for creating an environment more closely representative of in vivo development environments.[46]
See also
ADME
Catheter
Dosage form
Drug injection
Ear instillation
Hypodermic needle
Intravenous marijuana syndrome
List of medical inhalants
Nanomedicine
Absorption (pharmacology)
References
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^[1] Archived 2013-01-26 at the Wayback Machine Nee, Douglas, Pharm D, MS. "Rectal Administration of Medications at the End of Life". HPNA Teleconference, December 6, 2006, accessed November 2013.
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^Banerjee, Amrita; Ibsen, Kelly; Brown, Tyler; Chen, Renwei; Agatemor, Christian; Mitragotri, Samir (2018-06-20). "Ionic liquids for oral insulin delivery". Proceedings of the National Academy of Sciences. 115 (28): 7296–7301. Bibcode:2018PNAS..115.7296B. doi:10.1073/pnas.1722338115. ISSN 0027-8424. PMC 6048483. PMID 29941553.
^Hebert, Mary F. (2013). "Impact of Pregnancy on Maternal Pharmacokinetics of Medications". Clinical Pharmacology During Pregnancy. Elsevier. pp. 17–39. doi:10.1016/b978-0-12-386007-1.00003-9. ISBN 978-0-12-386007-1.
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^Diagram for respiratory zone
^Diagram for upper respiratory tract
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External links
The 10th US-Japan Symposium on Drug Delivery Systems
FDA Center for Drug Evaluation and Research Data Standards Manual: Route of Administration.
FDA Center for Drug Evaluation and Research Data Standards Manual: Dosage Form.
A.S.P.E.N. American Society for Parenteral and Enteral Nutrition
As Drug+Administration+Routes at the US National Library of Medicine Medical Subject Headings (MeSH)
v
t
e
Routes of administration, dosage forms
Oral
Digestive tract (enteral)
Solids
Tablet
Capsule
Pastille
Time release technology
Osmotic delivery system
Liquids
Decoction
Elixir
Electuary
Emulsion
Effervescent powder or tablet
Herbal tea
Hydrogel
Molecular encapsulation
Powder
Softgel
Solution
Suspension
Syrup
Tincture
Buccal (sublabial), sublingual
Solids
Orally disintegrating tablet
Film
Lollipop
Sublingual drops
Lozenges
Effervescent tablet
Chewing gum
Liquids
Mouthwash
Toothpaste
Ointment
Spray
Respiratory tract
Solids
Dry-powder inhaler
0 0
Liquids
Anesthetic vaporizer
Vaporizer
Nebulizer
Metered-dose inhaler (MDI)
Gas
Oxygen mask and Nasal cannula
Oxygen concentrator
Anaesthetic machine
Relative analgesia machine
Ophthalmic, otologic, nasal
Nasal spray
Ear drops
Eye drops
Ointment
Hydrogel
Insufflation
Mucoadhesive microdisc
Urogenital
Ointment
Pessary
Vaginal ring
Douche
Intrauterine device (IUD)
Extra-amniotic infusion
Intravesical infusion
Rectal (enteral)
Ointment
Suppository
Enema
Solution
Hydrogel
Murphy drip
Nutrient enema
Dermal
Ointment
Topical cream
Topical gel
Liniment
Paste
Film
DMSO solution
Electrophoretic system
Hydrogel
Liposomes
Transfersome vesicles
Cream
Lotion
Lip balm
Medicated shampoo
Dermal patch
Transdermal patch
Transdermal spray
Jet injector
Injection, infusion (into tissue/blood)
Skin
Intradermal
Subcutaneous
Injector pen
Transdermal implant
Organs
Intracavernous
Intravitreal
Intra-articular
Central nervous system
Intracerebral
Intrathecal
Epidural
Circulatory, musculoskeletal
Intravenous
Intracardiac
Intramuscular
Intraosseous
Intraperitoneal
Nanocell injection
Patient-controlled analgesia pump
PIC line
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Chi LW1, Lin SC1, Chang SH2, Wu HS3.
Biological research for nursing.Biol Res Nurs.2015 Oct;17(5):567-73. doi: 10.1177/1099800414562025. Epub 2014 Dec 14.
OBJECTIVE: To investigate the prevalence and patterns of and factors associated with hyperphagic behavior in Taiwanese patients with dementia living at home.METHODS: A cross-sectional and correlational design was used. A total of 104 patients with dementia and their primary caregivers were recruited
… Aim:Prevention of medication-related osteonecrosis of the jaw (MRONJ) in patients with osteoporosis requires the cooperation of physicians and dentists. … A total of 30% physicians had requested oral health care by a dentist before administering bone-modifying agents (BMA) therapy. …
… His spastic paraparesis was resistant to oral antispastic medication, however, his symptoms successfully improved after the initiation of intrathecal baclofen therapy, which thus allowed him to return to work. …
Oral Medication The first treatment for type 2 diabetes blood glucose (sugar) control is often meal planning, weight loss, and exercising. Sometimes these measures are not enough to bring blood glucose levels down near the normal ...
The online Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology library contains articles from 1948 to the present. Access to tables of contents and abstracts is complimentary, while access to articles is limited to print ...