"took one capsule before going to bed for a week to help sleep (arthritis). had a reaction of hypertension and tachycardia.  stopped taking anything extra beside regular meds.  took it again about a month later.  had the same reaction, only much worse.  ended up in the or.  realized what the cause was.  i have never taken anymore and condition has not returned after three months.  my doctors were not aware of this reaction from tylenol until i found this site."