Oxycontin is an opioid analgesic that treats moderate to severe pain when other opioids cannot manage it. It comes in various doses. It is white and has a round, convex shape marked OP on one side and 10 on the other. It begins working to relieve pain in about 2 to 4 hours, although it reaches its peak effect in 15 to 30 hours. Buy Oxycontin Online using Credit/debit card payment.