I've also stopped taking it recently. There were a couple of times where I had shortness of breath and some spasms in my chest, and one night after an angina attack (thank goodness I had nitroglycerin patches in the house!), I stopped the Xenadrine the next day. As a matter of fact, 60 mgs of Prozac makes me just as energetic and cuts my appetite, in addition to its intended purposes, and my secondary insurance covers it