It is an opioid painkiller and prodrug of morphine which is used for treatment of moderate to severe pain.It is available online you can buy codeine online in one click. Codeine is an opiate used for the treatment of any kind of pain either mild, moderate, or severe, and cough.The initial dosage for adults with pain is 15 mg to 60 mg orally up to every 4 hours as needed. The maximum dosage is 360 mg in a day.Keep in mind to avoid taking it with alcohol or other drugs that can cause drowsiness.