Tell your doctor of all nonprescription and prescription medication you may use, especially of: oral drugs used for diabetes. Also report drugs that may cause drowsiness such as: sleeping pills, anti-anxiety drugs, psychiatric medicines, certain antihistamines (e.g., diphenhydramine), muscle relaxants, narcotic pain relievers (e.g., codeine), anti-seizure drugs. Certain cough-and-cold preparations may also make you drowsy. Consult your pharmacist. Do not start or stop any medicine without doctor or pharmacist approval.