CIALIS Oral

CIALIS Oral 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

If you are taking fosamprenavir, amprenavir, ritonavir, nelfinavir, erythromycin, ketoconazole, or itraconazole (examples of potent inhibitors of CYP 3A4), do not take more than a 10 milligram dose of tadalafil in a 72 hour period. For more details contact your doctor or pharmacist.

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.