Metformin Hydrochloride Side Effects: weight gain !!!! . they made a mistake or something. i've gain mo http://www.medications.com/effect/view/20471 weight gain !!!! . they made a mistake or something. i've gain more weight now then ever. I've also gained weight, especially around the belly. What can I Fri, 01 Aug 2008 21:57:10 -0400 http://www.medications.com/effect/view/20471?item=10680 I've also gained weight, especially around the belly. What can I do? I exercise daily and look pregnant in a swim suit. http://www.medications.com/effect/view/20471?item=10680