### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Hi, My name is Elliott, I am a 25 yearold man about 5 10 165-70lbs I have a slightly over active thyroid that caused my heart beat (or so I ve been told) beat extra fast, along with other issues but that is irrelevant. There was a time when it was beating at around 167bpm at rest. So the my primary doc gave me Metropolol Er Succ at 25 mg daily, and recommended me to a endocrinologist to treat my thyroid. I took a pill I believe it was called Tapazol (pardon me, I dont have the script on me at the moment) and eventually my thyroid levels went down to normal so he automatically told me to stop taking the beta blocker. I did but I still experience rapid beats periodically and slight chest pains sometimes, although not that often. And I also read that you should be weened off gently from beta blockers for health reasons depending on the specific situation, which I still consider mine to be unknown. So I took it upon myself to go back on the bblockers that I had left over because there is obviously another underlying issue. Don t get me wrong I totally respect your profession and am not trying to play doctor, but I felt they should have followed up with a cardiologist before making such a rash decision. Basically what my question is, is this gonna be detrimental to my heart, and if not how long will it take to take effect? Also, my current heart beat is about 120 bpm at rest going off me just holding my hand on my heart with a stopwatch, Is that normal? I know that alot of stuff but you can even answer one of my questions I would greatly appreciate it, Thank you so much

### output:

Is it still irregular. If pulse rate is 120 at rest then its little higher, and you can continue metoprolol, there is no harm and keep monitoring your pulse rate at rest of at least 10 min. It should normalize after your thyroid is under control. Also test your hemoglobin I'd thyroid has normalizes. If heart rate is above 100 at rest you can continue with metoprolol and gradually taper to 12.5 mg and then stop. If you have further queries you can post. Thanks