Drug class review: Newer diabetes medications, TZDs, and combinations final original report
For reduction in HbA1c, pramlintide was similar to rapid acting insulin analog when added to insulin glargine or detemir (low SOE); sitagliptin monotherapy was less efficacious than metformin or glipizide monotherapy (low SOE); sitagliptin was not significantly different than rosiglitazone when eith...
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| Corporate Authors: | , , , , |
| Format: | eBook |
| Language: | English |
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Portland, Or.
Oregon Health & Science University
c2011, 2011
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| Series: | Drug class reviews
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| Online Access: | |
| Collection: | National Center for Biotechnology Information - Collection details see MPG.ReNa |
| Summary: | For reduction in HbA1c, pramlintide was similar to rapid acting insulin analog when added to insulin glargine or detemir (low SOE); sitagliptin monotherapy was less efficacious than metformin or glipizide monotherapy (low SOE); sitagliptin was not significantly different than rosiglitazone when either was added to metformin (moderate SOE); and there was no comparative evidence for saxagliptin (insufficient SOE). One head-to-head trial comparing exenatide with liraglutide reported a slightly greater reduction in HbA1c with liraglutide (between group difference 0.33%, 95% CI 0.47 to 0.18, low SOE). For reduction in HbA1c, exenatide was similar to glibenclamide (low SOE), rosiglitazone (low SOE), and insulin (with both groups also receiving oral diabetes agents, moderate SOE). For the TZDs, the available evidence indicates that pioglitazone and rosiglitazone are not statistically significantly different in their ability to reduce HbA1c (moderate SOE). Further, there were no significant differences in ability to reduce HbA1c between either TZD and sulfonylureas or metformin (moderate to high SOE). Both TZDs increase the risk of heart failure (high SOE), edema (high SOE), and fractures in women (moderate SOE). The risk of hypoglycemia is reduced with TZDs when compared with sulfonylureas; the risk is similar to the risk with metformin (high SOE). Both TZDs cause a similar degree of weight gain to that caused by sulfonylureas (moderate SOE). Little data was available to evaluate the long-term effectiveness of the newer medications compared with more established treatments, limiting our ability to determine how to best incorporate newer medications into clinical practice PURPOSE: To compare the effectiveness and adverse event profiles of amylin agonists, DPP-4 inhibitors, incretin mimetics, TZDs, and certain combination products for people with type 2 diabetes and for people with type 1 diabetes for pramlintide only. DATA SOURCES: To identify published studies, we searched MEDLINE, The Cochrane Library, Embase, International Pharmaceutical Abstracts, and reference lists of included studies through July 2010. We also requested dossiers of information from pharmaceutical manufacturers. REVIEW METHODS: Study selection, data abstraction, validity assessment, grading the strength of the evidence (SOE), and data synthesis were all carried out according to standard Drug Effectiveness Review Project methods. RESULTS: Most of the evidence was limited to adult populations. Most of the included studies evaluated intermediate outcomes, such as HbA1c or weight. Very few studies reported health outcomes and few studies were longer than 6 months. Liraglutide-treated subjects had greater reductions in HbA1c than subjects treated with glargine (low SOE), rosiglitazone (low SOE), or sitagliptin (low SOE), and similar or greater reductions than those treated with glimepiride (insufficient SOE). For weight, pramlintide, exenatide, and liraglutide (doses of 1.2 or greater) appear to cause weight loss compared with placebo. Sitagliptin and saxagliptin are likely weight neutral. Most studies evaluating weight change were 6 months or less and it is uncertain whether weight loss is sustained long-term. Rates of hypoglycemia were lower with sitagliptin than with glipizide (moderate SOE), with liraglutide than exenatide (low SOE), and with liraglutide than glimepiride (high SOE). Hypoglycemia rates were similar to placebo for sitagliptin and saxagliptin (low SOE) and were similar between exenatide and insulin (moderate SOE). Rates of gastrointestinal side effects were higher with exenatide and liraglutide than with comparators. For the amylin agonists, DPP-IV inhibitors, and GLP-1 agonists, we found no studies that focused on health outcomes as primary outcomes. Some studies of these drug classes reported some health outcomes such as all-cause mortality or number of people with macrovascular disease among secondary outcomes or adverse events, but overall evidence was generally insufficient to determine how medications in these classes compare with other treatments for their impact on health outcomes. For the newer diabetes drugs (pramlintide, sitagliptin, saxagliptin, exenatide, and liraglutide), all of the included medications were efficacious for reducing HbA1c compared with placebo. Although rosiglitazone now has restricted access due to an increased risk of cardiovascular adverse events, we found no evidence of increased all-cause mortality or cardiovascular mortality with pioglitazone; some studies suggest reduced risk of all-cause and cardiovascular mortality with pioglitazone (low SOE) For the FDCPs, we found no head to head trials that compared HbA1c control between any 2 FDCPs (insufficient SOE). Therapy with Avandamet,(r) Avandaryl,(r) Actoplus Met, or dual therapy with metformin and sitagliptin produced statistically significantly greater reductions in HbA1c compared to monotherapy with any of their respective components. CONCLUSION: All of the included medications were efficacious for reducing HbA1c and none of the newer medications appear to cause weight gain. |
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| Item Description: | Title from PDF cover (viewed Aug. 17, 2011). - "February 2011." |
| Physical Description: | 1 online resource |