My husbands Doctor prescribed 25 mg twice a day of metoprolol tartrate which he was on for 30 days then when returning to the Doctors was prescribed 100 mg twice a day of the same for 30 days and when returning to the Doctors with numerous side effects was told that the drug store had given him the wrong dosage it should have remained at 25 mg twice a day, now I've read all of the side effects and the possible outcomes of this over dosage but what I can't find is what happens from going 200mg a day to 50mg aday abruptly, because my husband is having a difficult time, it's like he is still having the same side effects of the higher dosage. Its been 5 days since he started the 50mg again and I'm worried.