Cialis

If Cialis gives you an allergic reaction, do not use it again.

Special warnings about Cialis

If you have heart problems severe enough to make sexual activity a danger, you should avoid using Cialis. If you take this drug and develop cardiac symptoms (for example, dizziness, nausea, and chest pain) during sexual activity, do not continue. Alert your doctor to the problem as soon as possible.

Because Cialis has not been studied in people with cardiovascular disease, it's best to avoid this drug if you've had a stroke or heart failure within the past 6 months, or a heart attack within the past 3 months. Be equally cautious if you have severe high or low blood pressure, heartbeat irregularities, or unstable angina (crushing heart pain that occurs at any time). If you develop angina after taking Cialis, seek medical attention immediately.

If you have severe kidney or liver problems, a bleeding disorder, stomach ulcer, or an inherited retinal disorder such as retinitis pigmentosa, use this medication with caution. Its safety under these circumstances has not yet been studied.

Rare cases of prolonged and sometimes painful erections (known as priapism) have been reported with drugs similar to Cialis. If you develop an erection that lasts more than 4 hours, seek medical treatment immediately. Otherwise, permanent damage and impotence could result.

If you have a condition that might result in long-lasting erections, such as sickle cell anemia, multiple myeloma (a disease of the bone marrow), or leukemia, use Cialis with caution. Also use caution if you have a genital problem or deformity such as Peyronie's disease.

Remember that Cialis offers no protection from transmission of sexually transmitted diseases, such as HIV, the virus that causes AIDS.

Possible food and drug interactions when taking Cialis

Be sure to check with your doctor about the medications that should never be taken with Cialis, including:

Alpha-blocking drugs prescribed for high blood pressure or prostate problems, including doxazosin (Cardura), terazosin (Hytrin), prazosin (Minipress), and alfuzosin (Uroxatral)
Nitrate-based drugs prescribed for chest pain, such as nitroglycerin patches (Nitro-Dur, Transderm-Nitro), nitroglycerin ointment (Nitro-Bid, Nitrol), nitroglycerin pills (Nitro-Bid, Nitrostat), and isosorbide pills (Dilatrate-SR, Isordil, Sorbitrate)
Street drugs known as "poppers," including amyl nitrate and butyl nitrate

Cialis could intensify the effects of certain drugs used to lower blood pressure. Be sure to tell your doctor if you take any of the following:

Angiotensin II receptor blockers, such as candesartan (Atacand), eprosartan (Tevetan) and irbesartan (Avapro)
Bendrofluazide
Enalapril (Vasotec)
Metoprol (Lopressor)