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, uncontrolled irregular heartbeat), low blood pressure, or uncontrolled high blood pressure
* you have had a heart attack within the past 90 days or you have had severe heart failure or a stroke within the past 6 months
* you are taking a nitrate (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 or nitrite, butyl nitrate or nitrite)
* you take another PDE5 inhibitor (eg, sildenafil, vardenafil) or another medicine that contains tadalafil
Contact your doctor or health care provider right away if any of these apply to you.
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