The doctor should be told of all prescription and nonprescription medications the patient uses, especially of: MAO inhibitors used within the last 2 weeks (e.g., furazolidone, linezolid, phenelzine, procarbazine, selegiline, tranylcypromine), erythromycin, cimetidine. Report the patient's use of drugs that cause drowsiness, such as: sleeping pills, sedatives, tranquilizers, anti-anxiety drugs, other narcotic pain relievers (e.g., codeine), drugs for mood or emotional problems, anti-seizure drugs, muscle relaxants, anti- histamines that cause drowsiness (e.g., diphenhydramine). Additionally, many cough-and-cold medicines contain ingredients that cause drowsiness. Ask the patient if they use any. If needed, consult the pharmacy about the safe use of those products. Other medications should not be started without doctor or pharmacist approval.