SN instructed patient and caregiver on new pain medication Nucynta ( Tapentadol ) is used to help relieve moderate to severe short - termpain ( such as pain from an injury or after surgery ). It belongs to a class of drugs known as narcotic ( opioid ) analgesics. It works in the brain to change how your body feels and responds to pain. Some Common side effects are nausea, vomiting, constipation, dizziness, or drowsiness. Get medical help right away if you have any serious side effects, including: slow / shallow breathing, fainting, seizures, unusual drowsiness / difficulty waking up may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching / swelling ( especially of the face / tongue / throat ), severe dizziness, trouble breathing.