Maybe the Xanax mixed with the Metoprolol caused your heart rate to be really low. I am a small woman and even a tiny, tiny dose of Metoprolol (a quarter of a 25 mg pill) caused my HR to go down in the 40s resting and my BP to be about 80/50 and I was on Xanax at the time, too. I now take another beta (propranolol) and the HR isn't so low, and it doesn't drop my blood pressure like metoprolol did. Maybe you should call your doctor and ask but I'm sure it's not dangerous - really athletic people have low heart rates but if it's so low it's making you feel groggy then maybe they can change your meds. Good luck!
My pulse for the last 40 yrs (before that I never checked my pulse) has always been between 48-54 before meds and since taking meds. I was put on beta blockers once in the ER due to a high BP crisis, and beta blockers to take home with me, and to take till I see the Cardiologist. The following days at home my heart rate dropped to 34 bpm even though the BP was not low, but still in the high normal range. I felt like total ****, absolutely no energy, did not want to get out of bed. Once I saw the Cardiologist I was referred to he immediately took me off the beta blockers. Everybody's case is different. .
Keep in mind my heart rate was always below 60 and that is why the beta blockers took my pulse all the way down to 34, I guess, But in your case a heart rate in the 50's on beta blockers I think is nothing to worry about. If you are still worried just call and ask the doctor what he thinks.
Resting heart rates in the 50's are quite normal and common in people who have excellent physical conditioning. Many athletes have rates even lower, particularly endurance athletes. I am 63 and my resting rate is typically in the high 50's. Before ablation when I was taking a beta blocker, my rate would sometimes creep down to the high 40's. The beta blocker did slow me down a little and made me feel tired.
thank you all for your responces.. I did call my dr, she said anything in the 50's range is normal and not to worry.