DEAR DR. ROACH: I just discontinued using metoprolol succinate extended release (ER) at a dosage of 6.25 mg. My heart rate is normally in the 70-80s, and my blood pressure is normal. My doctor prescribed it for palpitations, but it seems totally unnecessary. My issue is that I am experiencing tachycardia of over 100 beats every single night as well as dry mouth.Could thi...
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