Medications causing weight gain
The number of medications causing weight gain are too numerous to accurately list on this site. The more notorious ones are some of the antidepressants (especially SSRIs that were first introduced, like Prozac and Paxil, etc.), and some diabetes medications, especially insulin or those which increase insulin release from the pancreas. Hormones such as steroids and estrogen taken without progesterone are also culprits. If weight loss is one of your goals, it is a smart idea to have your medical provider review your medications and offer alternatives that will make your journey an easier road.
It is noteworthy to mention here that with very few exceptions, thyroid has only a small role in the conversation regarding obesity. Yes, it is involved in the regulation of primary metabolism but is generally treated well before a person has significant weight gain. In our experience, this is rarely a significant player.