Like all medicines, CIALIS can cause side effects, although not everybody gets them. These effects are normally mild to moderate in nature.
In this leaflet, when a side effect is described as ?very common? this means that it has been reported in at least 1 in 10 patients taking the medicine. When a side effect is described as ?common? this means that it has been reported in more than 1 in every 100 patients but less than 1 in every 10 patients. When a side effect is described as ?uncommon?, this means it has been reported in more than 1 in every 1,000 patients, but less than 1 in every 100 patients. When a side effect is described as ?rare?, this means it has been reported in more than 1 in every 10,000 patients, but less than 1 in every 1,000 patients.
Very commonly reported side effects in patients taking CIALIS were headache.
Commonly reported side effects in patients taking CIALIS include back pain, muscle aches, facial flushing, nasal congestion, dizziness and indigestion.
Uncommon side effects are allergic reactions including rashes, abdominal pain, reflux, blurred vision, eye pain, increased sweating, pounding heartbeat sensation, a fast heart rate, high blood pressure, low blood pressure and chest pain. In case of chest pain occurring during or after sexual activity you should NOT use nitrates but you should seek immediate medical assistance.
Rare side effects in patients taking CIALIS include fainting, migraine, seizures and passing memory loss, swelling of the eyelids, red eyes, sudden decrease or loss of hearing, hives and nose bleeds.
In rare instances it is possible that a prolonged and possibly painful erection may occur after taking CIALIS. If you have such an erection, which lasts continuously for more than 4 hours, you should contact a doctor immediately.
Heart attack and stroke have also been reported rarely in men taking CIALIS. Most, but not all of these men had known heart problems before taking this medicine. It is not possible to determine whether these events were directly related to CIALIS.
Partial, sudden, temporary, or permanent decrease or loss of vision in one or both eyes has been rarely reported.
Some additional side effects have been reported in men taking CIALIS at an estimated frequency of rare that were not seen in clinical trials. These include migraine, swelling of the face, serious skin rashes, some disorders affecting blood flow to the eyes, irregular heartbeats, angina and sudden cardiac death.
Effects were seen in one animal species that might indicate impairment of fertility. Subsequent studies in man suggest that this effect is unlikely in humans, although a decrease in sperm concentration was seen in some men.
If any of the side effects gets serious, or if you notice any side effects not listed in this leaflet, please tell your doctor or pharmacist.