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- a salt or ester of maleic acid; used as a nontricyclic antidepressant drug for psychomotor activation
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| Systematic (IUPAC) name | |
|---|---|
| (RS)-5-[4-(2-[methyl(pyridin-2-yl)amino]ethoxy)benzyl]thiazolidine-2,4-dione | |
| Clinical data | |
| Trade names | Avandia |
| AHFS/Drugs.com | monograph |
| MedlinePlus | a699023 |
| Licence data | EMA:Link, US FDA:link |
| Pregnancy cat. | B3 (AU) C (US) |
| Legal status | POM (UK) ℞-only (US) |
| Routes | Oral |
| Pharmacokinetic data | |
| Bioavailability | 99% |
| Protein binding | 99.8% |
| Metabolism | Hepatic (CYP2C8-mediated) |
| Half-life | 3-4 hours |
| Excretion | Renal (64%) and fecal (23%) |
| Identifiers | |
| CAS number | 122320-73-4 Y |
| ATC code | A10BG02 |
| PubChem | CID 77999 |
| IUPHAR ligand | 1056 |
| DrugBank | DB00412 |
| ChemSpider | 70383 Y |
| UNII | 05V02F2KDG Y |
| KEGG | D00596 N |
| ChEBI | CHEBI:50122 Y |
| ChEMBL | CHEMBL121 N |
| PDB ligand ID | RGZ (PDBe, RCSB PDB) |
| Chemical data | |
| Formula | C18H19N3O3S |
| Mol. mass | 357.428 g/mol |
|
SMILES
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InChI
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| N (what is this?) (verify) | |
Rosiglitazone (trade name Avandia, GlaxoSmithKline) is an antidiabetic drug in the thiazolidinedione class of drugs. It works as an insulin sensitizer, by binding to the PPAR receptors in fat cells and making the cells more responsive to insulin. It is marketed by the pharmaceutical company GlaxoSmithKline (GSK) as a stand-alone drug or for use in combination with metformin or with glimepiride. First released in 1999, annual sales peaked at approximately $2.5-billion in 2006; however, following a meta-analysis published in the New England Journal of Medicine in 2007 that linked the drug's use to an increased risk of heart attack,[1] sales plummeted to just $9.5-million in 2012. The drug's patent expired in 2012.[2]
Despite rosiglitazone's effectiveness at decreasing blood sugar in type 2 diabetes mellitus, its use decreased dramatically as studies showed apparent associations with increased risks of heart attacks and death.[3] Adverse effects alleged to be caused by rosiglitazone were the subject of over 13,000 lawsuits against GSK;[4] as of July 2010, GSK had agreed to settlements on more than 11,500 of these suits.
Some reviewers recommended rosiglitazone be taken off the market, but an FDA panel disagreed, and it remains available in the U.S.[5] From November 2011 until November 2013, the federal government did not allow Avandia to be sold without a prescription from a certified doctor; moreover, patients were required to be informed of the risks associated with its use, and the drug had to be purchased by mail order through specified pharmacies.[6] In November 2013, the FDA lifted its earlier restrictions on rosiglitazone after reviewing the results of the 2009 RECORD clinical trial (a six-year, open label randomized control trial), which failed to show the heart infarct risks associated with the drug.[7][8]
In Europe, the European Medicines Agency (EMA) recommended in September 2010 that the drug be suspended from the European market because the benefits of rosiglitazone no longer outweighed the risks.[9][10] It was withdrawn from the market in the UK and India in 2010,[11] and in New Zealand and South Africa in 2011.[12]
Contents
- 1 Medical uses
- 2 Adverse effects
- 2.1 Heart failure
- 2.2 Heart infarction
- 2.3 Death
- 2.4 Stroke
- 2.5 Bone fractures
- 2.6 Hypoglycaemia
- 2.7 Weight gain
- 2.8 Eye damage
- 2.9 Hepatotoxicity
- 2.10 Contraindications
- 3 Pharmacology
- 4 Society and culture
- 4.1 Sales
- 4.2 Lawsuits
- 4.3 Government investigations
- 4.3.1 United States investigations
- 4.3.2 European investigations
- 4.3.3 New Zealand
- 4.3.4 South Africa
- 4.4 Controversy and response
- 5 Research
- 6 References
- 7 External links
Medical uses
Glycemic control measured by glycosylated haemoglobin A1c (HbA1c) as a surrogate endpoint is similar to that of other oral antidiabetic drugs.[13][14] The controversy over adverse effects has dramatically reduced the use of rosiglitazone.[15]
Adverse effects
Heart failure
One of the safety concerns identified before approval was fluid retention. Moreover the combination of rosiglitazone with insulin resulted in a higher rate of congestive heart failure. In Europe there were contraindications for use in heart failure and combination with insulin.[16]
A meta analysis of all trials from 2010 confirmed a higher risk of heart failure and a double risk when rosiglitazone was administered as add-on therapy to insulin.[17] Two meta analyses of real life cohortstudies found a higher risk of heart failure against pioglitazone.[3][18] There were 649 excess cases of heart failure every 100,000 patients who receive rosiglitazone rather than pioglitazone.
Heart infarction
The relative risk of ischemic cardiac events seen in pre-approval trials was similar to that of comparators. However rosiglitazone is known the LDL cholesterol with 19%.[19][20]
In 2005, at the insistence of the World Health Organization, GSK performed a meta-analysis of all 37 trials involving use of rosiglitazone, finding a hazard ratio of 1.29 (0.99 to 1.89). In 2006 the GSK updated the analysis, now including 42 trials and showing a hazard ratio of 1.31 (1.01 to 1.70). GSK secretly provided these analyses to the FDA, but neither the company nor the FDA warned prescribers or patients of the hazard.[21]
A meta-analysis in May 2007 reported the use of rosiglitazone was associated with an 1,4 fold increased risk of heart attack and a numerically higher (but non-significant) increase in risk of death from all cardiovascular diseases against control. It contained 42 trials of which 27 were unpublished. They could be consulted as part of a legal settlement in relation to Glaxo's fraud with paroxetin.[1] Another meta analysis of 4 trials with follow-up longer than 1 year found similar results.[22]
The U.S. Food and Drug Administration (FDA) issued an alert on May 21, 2007.[23] On July 30, 2007, an Advisory Committee of the Food and Drug Administration concluded the use of rosiglitazone for the treatment of type 2 diabetes was associated with a greater risk of myocardial ischemic events (including heart attacks) than a placebo, but data from several long term, prospective clinical trials showed when rosiglitazone was compared to metformin, or sulfonylurea, there was no difference in the risk of heart attack. These data, coupled with the meta-analysis, prompted the FDA to state the data on the association between rosiglitazone and myocardial ischemia were inconclusive. The meta-analysis was not supported by an interim analysis of the trial designed to evaluate this, and several other reports have failed to resolve the controversy.
At the same time, a report by the Senate Finance Committee accused GlaxoSmithKline of knowing about the drug's risks well before they became public. The report also criticized the FDA for letting clinical trials continue, despite 83,000 heart attacks from 1999 to 2007 that the FDA linked to rosiglitazone. This Senate Committee report from November 2007 is entitled "The Intimidation of Dr. John Buse and the Diabetes Drug Avandia". The title refers to (temporarily successful) efforts made by GSK beginning in 1999 to intimidate an academic scientist from continuing to suggest Avandia had cardiovascular risk. The drug now bears a boxed warning about exactly this risk. GlaxoSmithKline maintains the drug is safe and the Senate report did not consider scientific evidence or the company's efforts to make known its concerns to the parties involved. However, the FDA still recommends patients continue taking it unless their doctors tell them otherwise.[24][25]
In 2000 a study to address the concerns regarding cardiovascular safety was requested by the European Medecines Agency (EMA). GSK agreed to perform post-marketing a long-term cardiovascular morbidity/mortality study in patients on rosiglitazone in combination with a sulfonylurea or metformin: the RECORD study. The results as published in 2009 showed non-inferiority with regard to cardiovascular events and cardiovascular death when the treatment with rosiglitazone was compared with metformin or a sulfonylurea. For myocardial infarction, there was a non-statistically significant increase in risk. In their assessment, the European regulators acknowledged weaknesses of the study, such as an unexpectedly low rate of cardiovascular events and the open-label design, which may lead to reporting bias. They found that the results were inconclusive.[16]
In February 2010, David Graham, the FDA's associate director of drug safety, recommended rosiglitazone be taken off the market. In June 2010, Graham et al., published a retrospective study of 227,571 elderly American patients, comparing roziglitazone to pioglitazone, the other thiazolidinedione marketed in the United States. The authors concluded rosiglitazone was associated with "an increased risk of stroke, heart failure, and all-cause mortality and an increased risk of the composite of AMI, stroke, heart failure, or all-cause mortality in patients 65 years or older".[26] The number needed to harm with roziglitazone was sixty. Graham argued rosiglitazone caused 500 more heart attacks and 300 more heart failures than its main competitor.
An updated meta analysis of 56 trials released in 2010, including the open label Record trial from 2009, found again an increased risk for heart infarction against control, but no increased risk for cardiovascular death.[27] A 2011 drug class review found an increased risk of cardiovascular adverse events.[28]
A meta-analysis of 16 observational studies released in March, 2011, provides more evidence that rosiglitazone is associated with a higher risk of heart failure, myocardial infarction and death than a similar agent, pioglitazone in real life. The meta-analysis involved 810 000 patients taking rosiglitazone or pioglitazone. The study suggests 170 excess myocardial infarctions, 649 excess cases of heart failure, and 431 excess deaths for every 100 000 patients who receive rosiglitazone rather than pioglitazone.[18][29] This was confirmed by another meta-analysis involving 945 286 patients in 8 retrospective cohort studies, most in the US.[3]
In 2012, the U.S. Justice Department announced GlaxoSmithKline had agreed to plead guilty and pay a $3 billion fine, in part for withholding the results of two studies of the cardiovascular safety of Avandia between 2001 and 2007.[30]
Death
There was no difference in al cause and vascular death in a meta analysis of 4 trials against controls.[28][31] But two meta analyses of real world cohorts found exces deaths against pioglitazone.[3][18]
Stroke
Avandia has been linked to stroke in a retrospective study. This study, led by FDA scientist David J. Graham, MD, MPH, by comparing the patient records of elderly patients using Avandia and alternative drug Actos, found Avandia increased the risk of stroke by over 27% relatively (for example, someone with a 1% risk of stroke taking Actos would have a 1.27% risk taking Avandia, on average).[32][33][34]
Bone fractures
GlaxoSmithKline reported a greater incidence of fractures of the upper arms, hands and feet in female diabetics given rosiglitazone compared with those given metformin or glyburide.[35] The information was based on data from the ADOPT trial[36] The same increase has been found with pioglitazone (Actos), another thiazolidinedione.
A meta-analysis of 10 RCTs, involving 13,715 patients and including both rosiglitazone- and pioglitazone-treated patients, showed an overall 45% increased risk of fracture with thiazolidone use compared with placebo or active comparator. It doubled the risk of fractures among women with type 2 diabetes, without a significant increase in risk of fractures among men with type 2 diabetes.[37]
Hypoglycaemia
The risk of hypoglycaemia is reduced with thiazolidinediones when compared with sulfonylureas; the risk is similar to the risk with metformin (high strenght of evidence).[28]
Weight gain
Both thiazolidinediones cause a similar degree of weight gain to that caused by sulfonylureas (moderate strength of evidence).[28]
Eye damage
Both rosiglitazone and pioglitazone have been suspected of causing macular edema, which damages the retina of the eye and causes partial blindness. Blindness is also a possible effect of diabetes, which rosiglitazone is intended to treat. One report[38] documented several occurrences and recommended discontinuation at the first sign of vision problems. A retrospective cohort study showed an association between the use of thiazolidinediones and the incidence of diabetic macular edema (DME). Both use was associated with a 2,3 higher risk at 1 year and at 10 year follow-up, rising to 3 if associated with insulin.[28]
Hepatotoxicity
Moderate to severe acute hepatitis has occurred in several adults who had been taking the drug at the recommended dose for two to four weeks. Plasma rosiglitazone concentrations may be significantly increased in patients with pre-existing hepatic impairment.[39]
Contraindications
Both rosiglitazone and pioglitazone are contraindicated in people with NYHA Class III and IV heart failure. They are not commanded for heartfailure.[40]
In Europe rosiglitazone was contraindicated for heart failure or history of heart failure with regard to all NYHA stages, for combined use with insulin and for acute coronary syndrome.[16] The European Medicines Agency recommended on 23 September 2010 that Avandia be suspended from the European market.[9][10]
Pharmacology
Rosiglitazone is a member of the thiazolidinedione class of drugs. Thiazolidinediones act as insulin sensitizers. They reduce glucose, fatty acid, and insulin blood concentrations. They work by binding to the peroxisome proliferator-activated receptors (PPARs). PPARs are receptors on the membrane of the cell nucleus. Thiazolidinediones enter the cell, bind to the nuclear receptors, and affect the expression of DNA. The several PPARs include PPARα, PPARβ/δ, and PPARγ. Thiazolidinediones bind to PPARγ.
Avandia 2-mg oral tablet
PPARs are expressed in fat cells, cells of the liver, muscle, heart, and inner wall (endothelium) and smooth muscle of blood vessels. PPARγ is expressed mainly in fat tissue, where it regulates genes involved in fat cell (adipocyte) differentiation, fatty acid uptake and storage, and glucose uptake. It is also found in pancreatic beta cells, vascular endothelium, and macrophages[41] Rosiglitazone is a selective ligand of PPARγ and has no PPARα-binding action. Other drugs bind to PPARα.
Rosiglitazone also appears to have an anti-inflammatory effect in addition to its effect on insulin resistance. Nuclear factor kappa-B (NF-κB), a signaling molecule, stimulates the inflammatory pathways. NF-κB inhibitor (IκB) downregulates the inflammatory pathways. When patients take rosiglitazone, NF-κB levels fall and IκB levels increase.[42]
Society and culture
Sales
US sales of the drug were of $2.2 billion in 2006.[43] Sales in 2Q 2007 down 22% compared to 2006.[44] 4Q 2007 sales down to $252 million.[45]
Though sales have gone down since 2007 due to safety concerns, Avandia sales for 2009 totalled $1.2 billion worldwide.[25]
Lawsuits
The Guardian reported lawsuits over the drug could total from $1 billion to $6 billion, based on research by analysts for UBS, who say 13,000 suits have been filed.[46] Included among those suing: Santa Clara County, California, which claims to have spent $2 million on rosiglitazone between 1999 and 2007 at its public hospital and is asking for "triple damages".[47] In May 2010, GlaxoSmithKline (GSK) reached settlement agreements for some of the cases against the company, agreeing to pay $60 million to resolve 700 suits.[48] In July 2010, GSK reached settlement agreements to close another 10,000 of the lawsuits against it, agreeing to pay about $460 million to settle these suits.[49][50] In a statement, Michael Miller, the attorney representing 1,500 patients in the suit, said about the settlement, "It's a compromise that allows both sides to put this behind them and move on."[51]
In 2012, the U.S. Justice Department announced GlaxoSmithKline had agreed to plead guilty and pay a $3 billion fine, in part for withholding the results of two studies of the cardiovascular safety of Avandia between 2001 and 2007. The settlement stems from claims made by four employees of GlaxoSmithKline, including a former senior marketing development manager for the company and a regional vice president, who tipped off the government about a range of improper practices from the late 1990s to the mid-2000s.[30]
Government investigations
The drug has been under investigation in the US and in Europe. In September 2010, the U.S. Food and Drug Administration (FDA) decided rosiglitazone can remain available, but with certain restrictions. But the European Medicines Agency has decided to stop making all rosiglitazone-containing antidiabetes medication available in Europe in 2010.[52]
United States investigations
In 2005, at the insistence of the World Health Organization, GSK performed a meta-analysis of all 37 trials involving use of rosiglitazone, finding a hazard ratio of 1.29 (0.99 to 1.89). In 2006 the GSK updated the analysis, now including 42 trials and showing a hazard ratio of 1.31 (1.01 to 1.70). GSK secretly provided these analyses to the FDA, but neither the company nor the FDA warned prescribers or patients of the hazard.[21] Following a 2007 study, an FDA advisory panel agreed Avandia did not cause a statistically significant increase in heart attacks. The FDA voted to keep the drug on the market; a few months later, however, the agency added a boxed warning about potential heart risks of Avandia.[53] A study was conducted evaluating the geographic variation in the use of rosiglitazone following the boxed warning issued in 2007. Residual use varied by state, which may be explained by uncertainty regarding how to translate FDA warnings into practice, by differences in coverage policies among health plans and in formularies among states, and by regional differences in the distribution and influence of pharmaceutical marketing, specialists, and opinion leaders.[54]
In 2007, a panel of independent researchers reported Avandia could, in fact, increase patients' risks of heart attack, but they recommended it remain on the market. An FDA oversight committee voted in 2007, eight to seven, to accept that advice and keep it on the market.[55]
GlaxoSmithKline was being investigated by the FDA and the US Congress regarding Avandia.
Senators Democrat Max Baucus and Republican Charles Grassley filed a report urging GSK to withdraw Avandia in 2008 due to the side effects. The report noted the drug caused 500 avoidable heart attacks a month, and Glaxo officials sought to intimidate doctors who criticized the drug. It also said GSK continued to sell and promote the drug despite knowing the increased risk of heart attacks and stroke.[56]
The Senate Finance Committee, in a panel investigation, revealed emails from GSK company officials that suggest the company downplayed scientific findings about safety risks dating back to 2000. It was also alleged by the committee that the company initiated a "ghostwriting campaign", whereby GSK sought outside companies to write positive articles about Avandia to submit to medical journals.[57] GSK defended itself by presenting data that its own tests found Avandia to be safe, although an FDA staff report showed the conclusions were flawed.[58]
On July 14, 2010, after two days of extensive deliberations, the FDA panel investigating Avandia came to a mixed vote. Twelve members of the panel voted to take the drug off the market, 17 recommended to leave it on but with a more revised warning label, and three voted to keep it on the market with the current warning label.[59][60] The panel has come to some controversy, however; on July 20, 2010, one of the panelists was discovered to have been a paid speaker for GlaxoSmithKline, arousing questions of a conflict of interest. This panel member was one of the three who voted to keep Avandia on the market with no additional warning labels.[61][62][63]
In 2011 the FDA has decided on revising its prescribing information and medication guides for all rosilitazone containing medicines. The US label for rosiglitazone (Avandia, GlaxoSmithKline) and all rosiglitazone-containing medications (Avandamet and Avandaryl) now include the additional safety information and restrictions.[64][65] The revised labels restrict use to patients already taking a rosiglitazone-containing medicine or to new patients who are unable to achieve adequate glycemic control on other diabetes medications and to those, who in consultation with their healthcare provider, have decided not to take Actos (pioglitazone) or other pioglitazone-containing medicines for medical reasons.[66]
In June 2013 an FDA Advisory Committee reviewed all available data, including a re-adjudicated RECORD trial, found no evidence of increased cardiovascular risk with Avandia, and voted to remove the restrictions on Avandia marketing in the United States. In November 2013, the US FDA removed these marketing restrictions on the product.[67] Under the FDA’s instruction, Avandia’s maker, GlaxoSmithKline, had funded the Duke Clinical Research Institute to re-analyze the raw data from the study. At the 2010 panel, three panelists voted that the existing warnings were good enough; two were back in 2013. Seven voted to make those warnings more onerous, and five of them returned. But of the 10 who voted to restrict Avandia’s use, only four returned. And of the 12 who voted in 2010 to withdraw Avandia from the market, only three came back.[68]
European investigations
In 2000 a study to address the concerns regarding cardiovascular safety was requested by the EMA, and the makers agreed to perform post-marketing a long-term cardiovascular morbidity/mortality study in patients on rosiglitazone in combination with a sulfonylurea or metformin: the RECORD study. The results as published in 2009 showed non-inferiority with regard to cardiovascular events and cardiovascular death when the treatment with rosiglitazone was compared with metformin or a sulfonylurea. For myocardial infarction, there was a non-statistically significant increase in risk. In their assessment, the European regulators acknowledged weaknesses of the study, such as an unexpectedly low rate of cardiovascular events and the open-label design, which may lead to reporting bias. They found that the results were inconclusive.[16] The European Medicines Agency recommended on 23 September 2010 that Avandia be suspended from the European market.[9][10]
According to a probe by the British Medical Journal in September 2010, the United Kingdom's Commission on Human Medicines recommended to the Medicines and Healthcare Products Regulatory Agency (MHRA) back in July 2010, to withdraw Avandia sale because its "risks outweigh its benefits". Additionally, the probe revealed that in 2000, members of the European panel in charge of reviewing Avandia prior to its approval had concerns about the long-term risks of the drug.[69][70]
New Zealand
Rosiglitazone was withdrawn from the New Zealand market April 2011 because Medsafe concluded the suspected cardiovascular risks of the medicine for patients with type 2 diabetes outweigh its benefits.[71]
South Africa
A notice issued by the Medicines Control Council of South Africa on July 5, 2011 stated that it had resolved on July 3, 2011 to withdraw all rosiglitazone-containing medicines from the South African market due to safety risks. It disallowed all new prescriptions of Avandia.[72]
Controversy and response
Following the reports in 2007 that Avandia can significantly increase the risk of heart attacks, the drug has been controversial. A 2010 article in Time uses the Avandia case as evidence of a broken FDA regulatory system that "may prove criminal as well as fatal". It details the disclosure failures, adding, "Congressional reports revealed that GSK sat on early evidence of the heart risks of its drug, and that the FDA knew of the dangers months before it informed the public." It reports, "the FDA is investigating whether GSK broke the law by failing to fully inform the agency of Avandia's heart risks", according to deputy FDA commissioner Dr. Joshua Sharfstein. GSK threatened academics who reported adverse research results, and received multiple warning letters from the FDA for deceptive marketing and failure to report clinical data.[73] The maker of the drug, GlaxoSmithKline, has dealt with serious backlash against the company for the drug's controversy.[74] Sales on the drug dropped significantly after the story first broke in 2007, dropping from $2.5 billion in 2006 to less than $408 million in 2009 in the US.[75]
In response to the rise in risk of heart attacks, the Indian government ordered GSK to suspend its research study, called TIDE, in 2010.[61][76] Takeda Pharmaceuticals responded to the controversy by running a large advertising campaign for its rival diabetes drug Actos, first in 2007 and again in 2010.[77] The FDA also halted the TIDE study in the United States.[78]
Three doctors' groups, the Endocrine Society, the American Diabetes Association and the American Association of Clinical Endocrinologists, urged patients to continue to take the drug as it would be much worse to stop all treatment, despite any associated risk, but that patients could consult their doctors and begin a switch to a different drug if they or their doctors find concern.[79][80][81] The American Heart Association said in a statement in June 2010: " ...the reports deserves serious consideration, and patients with diabetes who are 65 years of age or older and being treated with rosiglitazone should discuss the findings with their prescribing physician....". "For patients with diabetes, the most serious consequences are heart disease and stroke, and the risk of suffering from them is significantly increased when diabetes is present. As in most situations, patients should not change or stop medications without consulting their healthcare provider."[82][83]
Research
Rosiglitazone was thought to be able to benefit patients with Alzheimer's disease who do not express the ApoE4 allele,[84] but the phase III trial designed to test this showed that rosiglitazone was ineffective in all patients, including ApoE4-negative patients.[85]
Rosiglitazone may also treat mild to moderate ulcerative colitis, due to its anti-inflammatory properties as a PPAR ligand.[86]
References
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- ^ a b c d Chen X, Yang L, Zhai SD (2012). "Risk of cardiovascular disease and all-cause mortality among diabetic patients prescribed rosiglitazone or pioglitazone: a meta-analysis of retrospective cohort studies". Chin. Med. J. 125 (23): 4301–6. PMID 23217404.
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|accessdate=requires|url=(help) - ^ Freeman, David W (2010-06-29). "Diabetes Drug and Risk: Avandia Linked to Stroke, Heart Trouble, Deaths". CBS News.
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External links
- Rosiglitazone bound to proteins in the PDB: S-rosiglitazone, R-rosiglitazone
- Official website
- MedlinePlus article
- Medscape
- ClinicalTrials.gov NCT00265148 Brain Imaging Study of Rosiglitazone Efficacy and Safety in Alzheimer's Disease
- U.S. National Library of Medicine: Drug Information Portal - Rosiglitazone
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UpToDate Contents
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- 1. 糖尿病の治療におけるチアゾリジン thiazolidinediones in the treatment of diabetes mellitus
- 2. 2型糖尿病の予防 prevention of type 2 diabetes mellitus
- 3. 糖尿病における心不全 heart failure in diabetes mellitus
- 4. 成人の2型糖尿病における血糖の初期マネージメント initial management of blood glucose in adults with type 2 diabetes mellitus
- 5. 2型糖尿病における血糖コントロールおよび血管合併症 glycemic control and vascular complications in type 2 diabetes mellitus
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Related Links
- Rosiglitazone Maleate reference guide for safe and effective use from the American Society of Health-System Pharmacists (AHFS DI). ... May be added to glyburide/metformin fixed-combination therapy if hyperglycemia is not ...
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