tadalafil - oral, Cialis (cont.)

DRUG INTERACTIONS: Your doctor or pharmacist may already be aware of any possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with them first.See also How To Use section for drug-food interactions.This drug should not be used with the following medications because very serious (possibly fatal) interactions may occur: nitrates (e.g., nitroglycerin, isosorbide), nitroprusside (or any "nitric oxide donor" drugs), recreational drugs called "poppers" containing amyl or butyl nitrite.If you are currently using any of these medications, tell your doctor or pharmacist before starting tadalafil.Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially of: alpha-blocker medication (e.g., doxazosin, prazosin, terazosin), drugs that affect certain liver enzymes (CYP 3A4 substrates, inhibitors and inducers such as cimetidine, rifamycins, St. John's wort, or certain anti-seizure drugs), high blood pressure medicines, other medications for impotence.Do not take this medication with any other product that contains tadalafil or other similar medications used to treat erectile dysfunction/pulmonary hypertension (e.g., sildenafil, vardenafil).If you are also taking certain drugs (potent inhibitors of CYP3A4 such as fosamprenavir, amprenavir, ritonavir, nelfinavir, erythromycin, ketoconazole, itraconazole), you must place special limits on your use of tadalafil to reduce the risk of severe dizziness. If you are taking tadalafil as needed, do not take more than one 10-milligram dose of tadalafil in a 72-hour period. If you are taking tadalafil once a day, do not take more than 2.5 milligrams a day. Contact your doctor or pharmacist for more details.This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist.

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