Metoprolol is a selective β1 receptor blocker used in treatment of several diseases of the cardiovascular system, especially hypertension. Trade names Lopressor, Toprol-xl AHFS/Drugs.com monograph MedlinePlus a682864 Licence data US FDA:link Pregnancy cat. C (AU) C (US) Legal status ℞ Prescription only Routes Oral, IV Systematic (IUPAC) name (RS)-1-(Isopropylamino)-3-[4-(2-methoxyethyl)phenoxy]propan-2-ol Formula C15H25NO3 Mol. mass 267.364 g/mol SMILES eMolecules & PubChem