For the past several months, I've been having episodes of tachycardia. It's usually when I'm resting, like when sitting on the couch. It doesn't seem to be preceded by anxiety or stress. I take several medications. 200 mg of Lamictal, 800 mg of Skelatin, 200 mg of Topamax, 15 mg of Remeron, and 25 mg of Elavil. My doctor said he doesn't think any one of these alone are the cause of the tachycardia b/c they aren't high enough doses. Maybe the combination of them could be the cause? Or could it be some other underlying condition?