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: kava, sodium oxybate.Other medications can affect the removal of alprazolam from your body, which may affect how alprazolam works. Examples include azole antifungals (such as itraconazole, ketoconazole), cimetidine, certain anti-depressants (such as fluoxetine, fluvoxamine, nefazodone), drugs to treat HIV (delavirdine, protease inhibitors such as indinavir), macrolide antibiotics (such as erythromycin), rifamycins (such as rifabutin), St. John's wort, drugs used to treat seizures (such as carbamazepine, phenytoin), among others.Tell your doctor or pharmacist if you also take drugs that cause drowsiness such as: certain antihistamines (such as diphenhydramine), medicine for sleep or anxiety (such as diazepam, zolpidem), muscle relaxants, narcotic pain relievers (such as codeine), psychiatric medicines (such as chlorpromazine, risperidone, amitriptyline, trazodone).Check the labels on all your medicines (such as cough-and-cold products) because they may contain ingredients which cause drowsiness. Ask your pharmacist about the safe use of those products.Cigarette smoking decreases blood levels of this medication. Tell your doctor if you smoke or if you have recently stopped smoking.