Since starting to take Amitriptyline - started at 25mg at night then up to 50mg - my weight is piling on. I should think I've put on almost 2st in the last 18 months. I eat very healthily, go swimming twice a week plus one Aquafit class but haven't lost any weight at all. Has anyone else found that their weight has increased significantly whilst on Amytriptyline? If you stopped taking it, did you lose the gained weight?