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Viagra is solely used to treat impotency among men. Nevertheless, we can't leave the fact that every synthetic drug has it's own adverse effects. The side effects of Viagra were usually mild and moderate.

Subjects tested with Viagra on different trials and environment claim to experience the same kind of effects. Studies on fixed dosage showed that there is also an increase on the possibility of having adverse effects with an increase of the dosage. A study on flexible-dose was also conducted showed that the occurance of having adverse effects was similar to the prescribed dosage of Viagra.

The usually reported adverse effects were flushing and head ache. Patients having doses higher than the prescribed one's were known to have higher chance of having the effects. Dizziness, impaired sensory perception such as blurred vision, photosensitivity, chromotapsia, rhinitis or congestion of the nose, palpitation and dyspepsia were the usual known adverse effects.

The following events occurred in <2% of patients in controlled clinical trials; a causal relationship to VIAGRA is uncertain. Reported events include those with a plausible relation to drug use; omitted are minor events and reports too imprecise to be meaningful:

- Body as a whole: face edema, photosensitivity reaction, shock, asthenia, pain, chills, accidental fall, abdominal pain, allergic reaction, chest pain, accidental injury.

- Cardiovascular: angina pectoris, AV block, migraine, syncope, tachycardia, palpitation, hypotension, postural hypotension, myocardial ischemia, cerebral thrombosis, cardiac arrest, heart failure, abnormal electrocardiogram, cardiomyopathy.

- Digestive: vomiting, glossitis, colitis, dysphagia, gastritis, gastroenteritis, esophagitis, stomatitis, dry mouth, liver function tests abnormal, rectal hemorrhage, gingivitis.

- Hemic and Lymphatic: anemia and leukopenia.

- Metabolic and Nutritional: thirst, edema, gout, unstable diabetes, hyperglycemia, peripheral edema, hyperuricemia, hypoglycemic reaction, hypernatremia.

- Musculoskeletal: arthritis, arthrosis, myalgia, tendon rupture, tenosynovitis, bone pain, myasthenia, synovitis.

- Nervous: ataxia, hypertonia, neuralgia, neuropathy, paresthesia, tremor, vertigo, depression, insomnia, somnolence, abnormal dreams, reflexes decreased, hypesthesia.

- Respiratory: asthma, dyspnea, laryngitis, pharyngitis, sinusitis, bronchitis, sputum increased, cough increased.

- Skin and Appendages: urticaria, herpes simplex, pruritus, sweating, skin ulcer, contact dermatitis, exfoliative dermatitis.

- Special Senses: sudden decrease or loss of hearing, mydriasis, conjunctivitis, photophobia, tinnitus, eye pain, deafness, ear pain, eye hemorrhage, cataract, dry eyes.

- Urogenital: cystitis, nocturia, urinary frequency, breast enlargement, urinary incontinence, abnormal ejaculation, genital edema and anorgasmia, detachment/traction, paramacular edema and epistaxis.