After I was diagnosed with A-Fib I too was prescribed Metoprolol. My Cardiologist said it was to lower my High Blood Pressure even though I told her I have "White Coat Syndrome" & brought her a small calendar I'd filled in each day with my blood pressure scores, almost ALWAYS Normal. Her response: "Those Home Blood Pressure cuffs aren't accurate, you need to go to a Drug Store or Clinic to have blood pressure taken. At my next appt. I brought in a list of Side Effects that were the result of Metoprolol, & told her now my blood pressure cuff was registering Very Low numbers, asked her "What Do I Have To Do To Get Off THIS Pharma.-Poison?" She changed the Prescription to Diltiazin(?), & Oh Guess What, once Again - Mulit. side effects. Next Appt., Once Again she changed the Prescription to A New Drug. A Week later I saw my GP, & told him about my problem with all the (?) Blood Pressure Prescriptions. My Dr. asked, "Are You Married To That Cardiologist?" ... "NO" .... "You May want to consider finding a New Cardiologist." He suggested a couple of names. I followed his suggestion & find a new one who is So Much More Understanding. Now all I take is Low Dose Aspirin.