May be potentiated by MAOIs. May potentiate alcohol, general anesthetics, tranquilizers, sedative-hypnotics, other narcotic analgesics or CNS depressants. Induction of drug-metabolizing hepatic enzymes. Acetaminophen may cause false (+) urine test for 5-hydroxyindoleacetic acid. Codeine may increase serum amylase levels.
Tell your doctor of all prescription and nonprescription drugs you may use, especially of: “blood thinners” Tell your doctor or pharmacist of all prescription and nonprescription drugs you may use that cause drowsiness such as: medicine for sleep (e.g., sedatives), tranquilizers, anti-anxiety drugs (e.g., diazepam), narcotic pain relievers (e.g., codeine), psychiatric medicines (e.g., phenothiazines such as chlorpromazine, or tricyclics such as amitriptyline), anti-seizure drugs (e.g., carbamazepine), muscle relaxants, antihistamines that cause drowsiness (e.g., diphenhydramine). Because this medication contains acetaminophen, check with your doctor or pharmacist before taking other medications containing acetaminophen which is commonly found in nonprescription pain relievers and cough-and-cold products. Read labels carefully to check ingredients. This drug may interfere with the effectiveness of birth control pills. Discuss using other methods of birth control with your doctor. Do not start or stop any medicine without doctor or pharmacist approval.