Methimazole
hyperthyroidism
"I was put on methimazole 10 mg late May.  Within a month, I had gained 10 lbs, my finger and feet became swollen, pressure headaches that would not go away after taking Advil, it hurt just to walk, back pains, and I was soooooooo tired. I complained to my doctor and she lowered the dosage to 5 mg and then she took me off of it after my levels were ok.  Then last week, I've had to go back on it again but I've noticed that my symptoms aren't that severe this time but I'm still continueing to gain weight. My doctor says I need to be on it and try to have my hyperthyroidism go into remission.  I hate this drug! I've never felt this bad in my entire life but I have no choice but to be on it."