The phosphate salt of codeine occurs as white, needle-formed crystals or white crystalline powder. Codeine phosphate is freely soluble in water and marginally soluble in Alcoholic beverages. The molecular fat is 406.37. Its molecular formula is C18H21NO3•H3PO4 • ½ H2O, and it's the subsequent chemical structure.Promethazine with Codeine Oral A