Are you gaining weight despite leading the same lifestyle as before? You might not be at fault here if you are unable to lose weight despite your best efforts. It has now come to light that some medications can make you fat. If you have any mental disorders or are a diabetic your prescription medicines may be contributing to your weight gain. In fact weight gain due to medication is quite common. Some medicines can make you put on weight it is true. While this is good news for underweight people and okay for people with normal weight it may