Meptin Inhalation Solution also contains the following excipients: Anhydrous citric acid, sodium hydroxide (pH adjuster) and purified water. It has a pH of 3-4.
Procaterol hydrochloride is chemically 8-hydroxy-5-[(1RS,2SR)-1-hydroxy-2-isopropylamino-butyl]-quinolin-2(1H)-one monohydrochloride hemihydrate. Its molecular formula is C16H22N2O2HCl·½H2O with a molecular weight of 335.83.
Procaterol hydrochloride occurs as white to pale yellow-white crystals or crystalline powder. It is soluble in water, formic acid and methanol, slightly soluble in ethanol (95), and practically insoluble in diethyl ether. The pH of its aqueous solution (1-100) is 4-5. Its aqueous solution (1-20) shows no optical rotation. It gradually changes in color when exposed to light. Melting point: Approximately 195°C (decomposition).