Hi, Norco contains both hydrocodone and acetaminophen or paracetamol which is used to treat mild to moderate pains, cough, cold and fever etc. Side effects of Norco are nausea, vomiting, stomach pain, headache, dizziness, drowsiness, constipation, increased intracranial pressure, respiratory depression, cold or clammy skin, coma, confusion, fatigue, lightheadedness, loss of consciousness. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Zubayer Alam, General & Family Physician