I had this same problem earlier with Metoprolol before. I am vising a different cardiologist, next week. Please suggest some med I can ask the doc about that will NOT cause weight gain? Added 6 Nov 2014: But. I still need the name of some medications or the Class of Med like Calcium Channel Blocker etc.so I can discuss with my cardiologist. Please note I need that meds should not cause. Zyrtec withdrawal anxiety Metoprolol is used to treat many conditions such as after a heart attack (to prevent heart damage), heart failure, high blood pressure (hypertension), and irregular heart beat. It belongs to a group of medicines called beta-blockers. Beta-blockers work by blocking some natural chemicals in the body, to slow the heart rate and lower blood pressure. Metoprolol is also used to prevent migraine. Her only other past medical history includes hypertension for which she is using lisinopril, metoprolol, and hydrochlorothiazide. At this point, what further investigations do you think would be.