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Metoprolol also controls heart rate besides lowering blood pressure. It reduces burden on the heart ( preload) by improving better chamber filling and hence better heart function. However it can cause dizziness and orthostatic hypotension from excessive drop in blood pressure. In that case, metoprolol should be gradually tapered off to avoid palpitations, even flash heart failure in some cases from excessive heart beats. Please discuss with her doctor regarding the taper procedure. Usually at such low dosage, metoprolol can be lowered to 12.5 mg daily for a week and then discontinue. Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star on top).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/