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Avoid using Cialis, if you:
- use drugs containing nitric oxide donors. These drugs are used for many reasons, including for chest pain (angina) prevention and limiting the number of angina attacks.
- use any of the following medications: Erythrityl Tetranitrate, Boceprevir, Isosorbide Mononitrate, Nitroglycerin, Riociguat, Isosorbide Dinitrate, Pentaerythritol Tetranitrate, Telaprevir, Propatyl Nitrate.
- are allergic to Cialis or any other component used in Cialis.
- are advised by your physician, not to have sex due to cardiovascular problems or recent serious cardiovascular events.
The following are some rare but serious side effects of Cialis. In case you experience these side effects, immediately seek emergency care.
- Prolonged, painful erection (more than 4 hours); priapism can permanently damage your penis, if not treated immediately.
- Sudden decrease or loss of vision in one or both eyes
- Sudden decrease or loss of hearing
- Chest pain or irregular heartbeat
- Low blood pressure
- Dizziness
Before using Cialis, share the following with your healthcare provider:
- The list of all medications you take, including prescribed or over-the-counter meds, vitamins, herbal pills, etc. to avoid any complications and potential drug interactions
- If you specifically use any medications for high blood pressure, angina drugs, HIV drugs, oral antifungal drugs, antibiotics, other ED drugs, pulmonary arterial hypertension drugs, stomach acid drugs, epilepsy drugs, hepatitis C drugs
- If you ever had any reaction (allergic or unusual) to this or any other medication
- If you or any family member of yours have rare heart conditions or any problems related to heart, including heart failure, irregular heartbeats, or a heart attack
- If you recently had a major surgery
- If you recently had a stroke
- If you suffer from bleeding
- If you suffer from kidney problems or if you are having dialysis
- If you have ever had vision loss or any eye problem or disease
- If you have stomach ulcers
- If you have liver problems
- If you have high or low blood pressure
- If you have a deformed penis
These are the most common side effects of Cialis:
- Headache
- Flushing
- Dizziness
- Nausea
- Rash
- Heartburn
- Runny or stuffy nose
- Upset stomach
- Back pain

Cialis does not protect against sexually transmitted diseases, including HIV or AIDS. Always use protection and ask your doctor about this if you need more info.