It is an opioid pain relief medication that is prescribed with other medications or alone. It is mainly used to relieve moderate to severe pain of acute, chronic, and other types. It is also used after any surgeries or injuries that cause pain, and also prescribed to take it to avoid cause of toxicity. It should be taken according to the given prescription because it has active potential for dependence. While you are taking it might cause some common side effects that can be gone after some time while continuing this medication. The side effects are drowsiness, dizziness, vomiting, constipation, headache, dry mouth, and stomach pain. If any of these side effects cause you any problems, you can contact your doctor.