I started having irregular heart beats after taking this drug for aprox. 8 months which progressively got worse. After stopping metoprolo under doctors orders I developed pacs & pvcs. My cardiologist started me back on it 50mg.twice a day. Side effects of muscle pain & weakness fatigue were too bad & he told me to wean myself off of it. Pacs & pvcs came back. Are there other options to control the irregular heartrate?