high blood pressure
"I took exactly one pill and woke up the next day with the worse headache : top of my head hurt, temples were squeezing, had pressure in my eyes, and couldn't tolerate sounds. How ironic that people take this to prevent migraines! I was done after 1 day. This came after 4 days on metoprolol (sp), which had
left me exhausted and short of breath, so I wasn't exactly 100%.  B.P. went up somewhat the day I was on this. Headache left as soon as I went off it. (Was put on valsartan right after, and had terrible back/spine pain from that.) I think I am done with meds. Maybe I'll  do yoga."