Levothyroxine
"I had a total thyroid removal after cancer was found, five years ago. I also lost 2 out of 4 parathyroid glands in the operation which depletes my calcium intake. Please be aware we need our thyroids to survive if you stop medication and don't have enough supply naturally you will get very ill within a short period and end up getting something like pneumonia and possibly die.  I have been on it 5 years now and have slowly and steadily gained weight, this could be aging, having children, etc.  But have spoken to others who also tried to get weight off and couldn't do anything about it even with a personal trainer!. I am on 200mg a day for 6 days a week to suppress my TSH to stop cancer cells growing again."