Codeine Drug DescriptionCodeine is an opiate used to treat pain, coughing, and diarrhea. It is typically used to treat mild to moderate degrees of pain. Greater benefit may occur when combined with paracetamol or a nonsteroidal anti-inflammatory drug such as aspirin or ibuprofen. Wikipedia Formula: C18H21NO3 IUPAC ID: (5α,6α)-7,8-didehydro-4,5-epoxy- 3-methoxy-17-methylmorphinan-6-ol Other names: 3-Methylmorphine Onset of action: 15–30 minutes Elimination half-life: 2.5–3 hours Duration of action: 4–6 hours Addiction liability: High Codeine phosphate is a opioid analgesic medication used for the treatment of mild to moderate pain. Codeine is often used when relief is not provided by other pain killers such as ibuprofen or paracetamol.