I am relieved I found this forum. I thought I had lost my mind. I started taking Warfarin sodium in the beginning of August. Since then I've experienced memory lapses, fatigue and dizziness when I roll over while lying down. Only the latter is (kind of) listed as an "official" side effect. I take 7 mgs daily and NO other drugs. Warfarin has to be the cause, but my doctor says it's not.