OxyContin OP 80 mg belongs to the narcotic analgesic category of drugs that helps treat chronic pain. It is available with an imprint OP 80, green in color and round in shape. It is a prescription drug. Walgreens USA is the only supplier of this drug, and they do the labeling also. How to buy OxyContin OP 80 mg online in the USA and Canada? It is easy to buy OxyContin OP 80 mg online, but you should buy it from websites that have proper authentication in the USA and Canada.