Tramadol 50 CAPSULESSustained Release is a narcotic-like pain reliever. Tramadol is used to treat moderate to severe pain. Tramadol extended-release is used to treat moderate to severe chronic pain when treatment is needed around the clock. Do not take it in larger doses or for longer than recommended by your doctor. Do not take more than 300 milligrams of tramadol in one day.