Codeine is a prescribed medication; used for the treatment of various pain. It is an FDA-approved medication buy it with or without a prescription. Take Codeine Sulfate directly by mouth, before or after taking breakfast or lunch. This medication belongs to an opioid drug class and changes a certain natural amount of substance in the central nervous system. There are four types of different variants available; Codeine 15 mg, Codeine 30 mg, Codeine 60 mg, and Codeine 300/30 mg.