high blood pressure
"I was put on 50mg of Metoprolol ER after chronic neck pain pushed my blood pressure up to 200/125. The initial side effects were awful. Dizziness, nausea, chest pain, and zombie-like fatigue. I've been on it almost 8 weeks now and thankfully all of the side effects have subsided, but it did take at least 6 weeks for that to happen. Blood pressure consistently runs 125/85 now. As an added bonus, it works wonderfully for migraine prevention. I used to get 2-3 a month but have not had any since starting this medication."