Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Some products that may interact with this drug include: certain antidepressants (such as amitriptyline, nortriptyline, phenelzine), certain antibiotics (carbapenems such as imipenem), mefloquine, orlistat, other medications for seizure (such as ethosuximide, lamotrigine, rufinamide, topiramate), vorinostat, warfarin, zidovudine.

Tell your doctor or pharmacist if you are taking other products that cause drowsiness including alcohol, marijuana (cannabis), antihistamines (such as cetirizine, diphenhydramine), drugs for sleep or anxiety (such as alprazolam, zolpidem), muscle relaxants (such as carisoprodol, cyclobenzaprine), and opioid pain relievers (such as codeine, hydrocodone).

Check the labels on all your medicines (such as allergy or cough-and-cold products) because they may contain ingredients that cause drowsiness. Ask your pharmacist about using those products safely.

This drug may interfere with certain lab tests (such as urine ketones). Make sure lab personnel and your doctors know you use this medication.