FOR INHALATION USE ONLY–NOT FOR INJECTION.
Metaproterenol Sulfate Inhalation Solution USP is a unit-dose bronchodilator administered by oral inhalation with the aid of an intermittent positive pressure breathing apparatus (IPPB). It contains 0.4% or 0.6% metaproterenol sulfate in a sterile, acidic, aqueous solution containing edetate disodium, sodium chloride, hydrochloric acid and/or sodium hydroxide for pH adjustment.
Chemical, metraproterenol sulfate is 3,5 dihydroxy-α-[(isopropylamino)methyl] benzyl alcohol sulfate (2:1), a white crystalline, racemic mixture of two optically active isomers. It differs from isoproterenol hydrochloride by having two hydroxyl groups attached at the meta positions on the benzene ring rather than one at the meta and one at the para position.