My husband sees his heart Dr every 3 months. He went yesterday & forgot to tell her he was taking a new med, prescriped by our family Dr., Metoprolol Succ ER 25 mg, 1 daily. The heart Dr told my husband she wanted him to take a new med. We just picked it up from the pharmacy, it is Metoprolol Tartrate 25 mg, 1 daily. Are these 2 drugs badically the same? Should he take both of them or just the one the heart Dr prescriped? Thank you.