Synonyms: Metoprolol Succinate, Butanedioic acid compd. with 1-[4-(2-methoxyethyl)phenoxy]-3-[(1-methylethyl)amino]-2-propanol (1:2), 1-[4-(2-Methoxyethyl)phenoxy]-3-[(1-methylethyl)amino]-2-propanol butanedioate (2:1) (salt), Beloc-Zok, Betaloc CR, Betaloc Zok, Betazok, H 93/26 succinate, Metoprolol succinate, Seloken-Zok, Selozok, Toprol XL, Butanedioic acid compd. with (+/-)-1-[4-(2-methoxyethyl)phenoxy]-3-[(1-methylethyl)amino]-2-propanol (1:2), (+/-)-1-[4-(2-Methoxyethyl)phenoxy]-3-[(1-methylethyl)amino]-2-propanol butanedioate (2:1) (salt)