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Immediate-release metoprolol tablets come in a number of strengths, including: 1  Lopressor or generic metoprolol tartrate 50 mg. 2  Lopressor or generic metoprolol tartrate 100 mg.
LopressorÂ® (metoprolol tartrate) Injection, USP Rx only DESCRIPTION. Lopressor, metoprolol tartrate USP, is a selective betai-adrenoreceptor blocking agent, available in 5-mL ampuls for intravenous administration. Each ampul contains a sterile solution of metoprolol tartrate USP, 5 mg, and sodium chloride USP, 45 mg, and water for injection USP. Metoprolol tartrate USP is (Â±)-1-(Isopropylamino)-3-[p-(2-methoxyethyl)phenoxy]-2-propanol L-(+)-tartrate (2:i) salt, and its structural formula is: