I felt my heartbeats exaggerated (in my opinion) and especially at night even though I am in NSR; I felt headachy and a slight dizziness on rising that was not my norm. I almost never get headaches. I think it was also constipating. I just didn't feel "right" and then when I looked up the drug in my old drug handbook, the first thing after the basic drug name and use were Black Box Warnings! Granted, I don't have any of the conditions that are named to avoid the drug, but I surely didn't like all the serious side effects that it can cause. Psychologically I just couldn't continue to take something that I didn't even know that I really needed.