{"id":1634,"date":"2018-02-14T17:20:25","date_gmt":"2018-02-14T17:20:25","guid":{"rendered":"https:\/\/blogs.bmj.com\/bmjebmspotlight\/?p=1634"},"modified":"2018-04-27T10:04:59","modified_gmt":"2018-04-27T10:04:59","slug":"centrally-acting-drugs-obesity-cause-harm-good","status":"publish","type":"post","link":"https:\/\/blogs.bmj.com\/bmjebmspotlight\/2018\/02\/14\/centrally-acting-drugs-obesity-cause-harm-good\/","title":{"rendered":"Centrally-acting drugs for obesity cause more harm than good"},"content":{"rendered":"<p>&nbsp;<\/p>\n<p><em>Centrally acting medicines increase the chance of losing at least 5% of body weight, but their use increases the risks\u00a0of serious of harms<\/em><\/p>\n<p style=\"text-align: right\">Igho Onakpoya<\/p>\n<hr \/>\n<p><a href=\"https:\/\/blogs.bmj.com\/bmjebmspotlight\/files\/2017\/11\/index.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-thumbnail wp-image-1543 alignleft\" src=\"https:\/\/blogs.bmj.com\/bmjebmspotlight\/files\/2017\/11\/index-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" srcset=\"https:\/\/blogs.bmj.com\/bmjebmspotlight\/files\/2017\/11\/index-150x150.jpg 150w, https:\/\/blogs.bmj.com\/bmjebmspotlight\/files\/2017\/11\/index.jpg 225w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>Are the benefits and harms of currently available centrally-acting weight loss drugs (medicines that act on the brain) different from those withdrawn from the market at the time of approval?<\/p>\n<p>Well, not really. And the methods used to assess benefits and harms of medicines with similar mechanisms of action require improvements.<\/p>\n<p>We assessed the benefits and harms of centrally acting weight loss medicines using data from <a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pubmed\/29399971\">pivotal trials<\/a> (i.e., the trials drug manufacturers used as evidence to gain marketing licenses). We also compared the benefits and harms of currently approved medicines with those that have been withdrawn from the market after approval because of concerns over harms.<\/p>\n<p>In total, we included five products (16 trials with 24,555 participants) \u2013 three (lorcaserin, naltrexone-bupropion and phentermine-topiramate<strong>) <\/strong>of which are currently available and two (rimonabant and sibutramine) withdrawn from the market because of serious adverse reactions.<\/p>\n<p>Centrally acting medicines increased the chance of losing at least 5% of body weight, but their use was\u00a0associated with increased risk of harms and discontinuation because of these harms. In particular, the risk of nervous and psychiatric adverse events was\u00a0significantly increased: this was the main reason previous medicines with similar mechanisms of action were withdrawn from the market <a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC5126837\/\">(2).<\/a><\/p>\n<p>The quality of the evidence on which their approval was based on was variable. Of note, while post-marketing trials of withdrawn medicines are available in the published literature, similar trials for the presently available ones are scarce.<\/p>\n<p>There\u2019s a real need to have better-designed studies, better outcomes reporting (particularly harms), and improved postmarketing monitoring of these harms.<\/p>\n<hr \/>\n<p><strong><em>Reference<\/em><\/strong><\/p>\n<p class=\"title\"><a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pubmed\/29399971\">Benefits and harms in pivotal trials of oral centrally acting antiobesity medicines: A systematic review and meta-analysis.\u00a0<\/a><span style=\"font-size: 1rem\">Onakpoya IJ, Collins DRJ, Bobrovitz NJH, Aronson JK, Heneghan CJ.\u00a0<\/span><span class=\"jrnl\" style=\"font-size: 1rem\" title=\"Obesity (Silver Spring, Md.)\">Obesity (Silver Spring)<\/span><span style=\"font-size: 1rem\">. 2018 Feb 5. doi: 10.1002\/oby.22118.\u00a0<\/span><\/p>\n<hr \/>\n<p><em>Igho J. Onakpoya is a Physician and Research Fellow at the Centre for Evidence-Based Medicine, Nuffield Department of Primary Care Health Sciences, University of Oxford. <\/em><\/p>\n<p>Competing interests: None declared<\/p>\n<p>Acknowledgements: Professor Carl\u00a0Heneghan\u00a0for useful suggestions.<!--TrendMD v2.4.8--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; Centrally acting medicines increase the chance of losing at least 5% of body weight, but their use increases the risks\u00a0of serious of harms Igho Onakpoya Are the benefits and harms of currently available centrally-acting weight loss drugs (medicines that act on the brain) different from those withdrawn from the market at the time of [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/blogs.bmj.com\/bmjebmspotlight\/2018\/02\/14\/centrally-acting-drugs-obesity-cause-harm-good\/\">Read More&#8230;<\/a><\/p>\n","protected":false},"author":1,"featured_media":1456,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14370],"tags":[],"class_list":["post-1634","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorised"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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