Topamax Side Effects: I have been taking Topamax, 25 mg. for one week. Today was the fi http://www.medications.com/effect/view/31082 I have been taking Topamax, 25 mg. for one week. Today was the first day I took 2. My doctor prescribed it for migraines, which I was having several times a month. The past few times I thought I was having a heart attack! I read about the side effects befor I am kind of in the same boat as you. I just started increasing Wed, 04 Jun 2008 10:20:44 -0400 http://www.medications.com/effect/view/31082?item=8905 I am kind of in the same boat as you. I just started increasing my dose to 50 mg so I take 1- 25 mg in the morning and 1- 25 mg at night. I have quickly realized that my morning coffee can no longer exist because I too feel like I am having a hear attack http://www.medications.com/effect/view/31082?item=8905