Viagra Side Effects Info
Viagra is a drug destined to treat male erectile dysfunction. As all drugs the trio Viagra Cialis Levitra has its own side effects, contra-indications and compatibility with other drugs.

Heart attack is one possible but very rare Viagra side effect. As a matter of fact such unexpected Viagra side effect as the damage of penile tissue may consequently result into permanent impotence.
During the time of clinical trials nearly 15,000 men tested the Tadalafil and all the side effects which were disclosed were caused by the ability of all PDE-5 inhibition to make blood vessels widen: back and eye pains, nausea, itch, flushing, runny nose, indigestion. Usually such Viagra side effects last not more than few hours. Back pain, though may occur only 12 to 24 hours after taking the drug and disappears in 48 hours.

Non-arthritic anterior ischemic optic neuropathy (NAION) is another Viagra side effect. It is happens because Viagra inhibits enzymes PDE-6, that causes high sensitivity of the eye photoreceptors. But the clinical trials proved that factors which lead to the development of NAION could have been others (for instance, diabetes, hypertension, smoking, age over 50, coronary artery disease), because the number of NAION events happened with the PDE-6 users was the same among the non-users.

Each time a new Viagra side effect is found a new label or warning appears on package. Thus, after the announcement that PDE-5 causes sudden hearing loss, clinicians were alerted by the corresponding changes in the package and the directions. Viagra side effects are numerous but appear only to those who take big dosages 600-800 mg - almost in 100% of cases.

Because of so numerous side effects Viagra prescription is always required by pharmacists but it is possible to buy Viagra online having been counseled by a doctor that works online.