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This is an independent website that provides information about Cialis. It is not affiliated with Eli Lilly and Company, the manufacturers of Cialis, and does not represent Eli Lilly and Company in any way whatsoever.
Cialis, like all drugs, can cause side effects in some people. If you display what you believe could be an allergic reaction to Cialis, stop using Cialis and inform your doctor straight away. An allergic reaction can exhibit itself in any of the following ways:
Common side effects of cialis include indigestion, back pain, aching muscles, facial flushing and a blocked nose.
Rare side effects can include allergic reactions (as above), visual disturbances or sudden vision loss, eye pain, red or swollen eyes, tinnitus or hearing loss, chest pain, nausea, sweating, feeling unwell, an irregular heartbeat, swellings in the extremities, seizures, dizziness and fainting, nosebleeds or a prolonged or painful erection that last more than 4 hours (priapism).
Cialis (and other PDE5 inhibitors) can decrease blood flow to the optic nerve of the eye, causing sudden vision loss. This side effect has occurred in a small number of people taking Cialis, most of whom also had pre-existing conditions including heart disease, diabetes, high blood pressure, high cholesterol, certain pre-existing eye conditions, or were smokers aged over 50. It is not certain whether Cialis (or the other pDE5 inhibitors) were the actual cause of the vision loss. Nevertheless, if you have sudden vision loss stop using Cialis and seek emergency medical treatment.
You should also seek medical attention if you suffer from Priapism.
This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.