August 31, 2017 at 3:45 pm I am a migraine sufferer. Approximately 18 mos ago I was put on beta blocker Metoprolol (25 mg twice a day) as a preventative to reduce headache frequency and severity. I had no problems with the medication, other than slight lethargy and a few pounds gained. About 6 weeks ago, however, my pharmacy advised they had switched to a different manufacturer, and things went quickly downhill. My bp, which is usually steady and in the good range of 120/67 started going all over the place from lows to highs, with accompanying rapid heart beats...