Cialis is a phosphodiesterase inhibitor. It works by helping to increase blood flow into the penis during sexual stimulation. This helps you to achieve and maintain an erection.
Do NOT use Cialis if
you are allergic to any ingredient in Cialis
you have severe kidney problems and will be taking Cialis daily
you have severe liver problems or certain hereditary degenerative eye problems eg, retinitis pigmentosa
you have certain heart problems eg, unstable angina, angina during sexual intercourse, severe heart failure, uncontrolled irregular heartbeat, low blood pressure, or uncontrolled high blood pressure
you have had a heart attack within the past 90 days or a stroke within the past 6 months
you are taking nitrates eg, isosorbide, nitroglycerin in any form eg, tablet, capsule, patch, ointment or nitroprusside
you have been advised by your doctor to avoid sexual activity because of heart problems
you use certain recreational drugs called “poppers” eg, amyl nitrate, butyl nitrate
Contact your doctor or health care provider right away if any of these apply to you.
Before using Cialis
Some medical conditions may interact with Cialis . Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you
if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
if you have allergies to medicines, foods, or other substances
if you have a deformed penis eg, Peyronie disease, cavernosal fibrosis, blood problems eg, sickle cell anemia, leukemia, multiple myeloma, or any other condition that may increase the risk of a prolonged erection priapism
if you have a history of certain eye problems eg, retinitis pigmentosa, sudden vision loss, optic neuropathy, macular degeneration
if you have a history of liver or kidney problems, dialysis, high or low blood pressure, ulcers, bleeding problems, blood vessel problems, heart problems eg, heart failure, irregular heartbeat, aortic stenosis, angina, or blood vessel problems
if you have a history of heart attack, stroke, or life-threatening irregular heartbeat
Some MEDICINES MAY INTERACT with Cialis . Tell your health care provider if you are taking any other medicines, especially any of the following
Alpha-blockers eg, doxazosin, medicines for high blood pressure, nitrates eg, isosorbide, nitroglycerin, or nitroprusside because severe low blood pressure with dizziness, lightheadedness, and fainting may occur
Azole antifungals eg, itraconazole, HIV protease inhibitors eg, ritonavir, macrolide antibiotics eg, erythromycin, or telithromycin because they may increase the risk of Cialis ‘s side effects
Rifampin because it may decrease Cialis ‘s effectiveness
This may not be a complete list of all interactions that may occur. Ask your health care provider if Cialis may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.



