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Common side effect of Viagra:

  • headache
  • flushing
  • abnormal vision, changes in color vision, blurred vision
  • dizziness, nausea;
  • runny or stuffy nose, nosebleeds;
  • sleep problems (insomnia);
  • chest pain, back pain, stomach pain, muscle pain;
  • diarrhea, upset stomach;
  • memory problems.

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Side effects are usually mild or moderate in their severity and transient in nature.

Studies of a fixed Viagra dosage have shown that the frequency of certain adverse reactions increases with the dosage increasing. Do not exceed the recommended daily dose of the drug.

Other possible side effects of Viagra

  • Immune system: rare side effects – hypersensitivity reactions (including rashes), allergic reactions.
  • Eyesight: frequent side effects – blurred vision; infrequent side effects – eye pain, photophobia, photopsia, eye redness, change of brightness in vision, conjunctivitis, bleeding in the eye tissue, cataracts, disruption of the lacrimal apparatus; rare side effects – swelling of the eyelids and surrounding tissues, feeling of dryness in the eyes, the presence of bright circles, light fatigue of eyes, yellow vision of objects, the vision of objects in red, the mucous membrane irritation, eye discomfort; the frequency is unknown – anterior ischemic optic neuropathy, retinal vein occlusion, visual defects, diplopia, temporary loss of vision or blurred vision, increased intraocular pressure, retinal edema, retinal vascular diseases, vitreous detachment / vitreous traction.
  • Hearing: rare side effects – sudden decrease or loss of hearing, tinnitus, ear pain.
  • Cardiovascular system: frequent side effects – accelerated heart rate; rare side effects – tachycardia, palpitations, decreased blood pressure, increased heart rate, unstable stenocardia, AV-blockade, myocardial ischemia, cerebral thrombosis, cardiac arrest, heart failure, abnormalities in an electrocardiogram, cardiomyopathy; rare side effects – atrial fibrillation.
  • Hematopoietic system: rare side effects – anemia, leukopenia.
  • Metabolism and nutrition: rare side effects – feeling of thirst, edema, gout, uncompensated diabetes mellitus, hyperglycemia, peripheral edema, hyperuricemia, hypoglycemia, hypernatremia.
  • Respiratory system: frequent side effects – nasal congestion; rare effects – nosebleeds, rhinitis, asthma, dyspnea, laryngitis, pharyngitis, sinusitis, bronchitis, increased sputum, increased cough; rare side effects – feeling of tightness in the throat, dryness of mucous membranes of the nose, swelling of the nasal mucosa.
  • Digestive system: frequent side effects – nausea, dyspepsia; infrequent side effects – gastroesophageal reflux disease, vomiting, abdominal pain, dry mouth, glossitis, gingivitis, colitis, dysphagia, gastritis, gastroenteritis, esophagitis, stomatitis, liver function deviation from the norm, rectal bleeding; rare side effects – hypoesthesia of oral mucosa.
  • Musculoskeletal system: frequent side effects – back pain; rare side effects – myalgia, pain in the extremities, arthritis, arthrosis, tendon rupture, tenosynovitis, bone pain, myasthenia, synovitis.
  • Genitourinary system: infrequent side effects – cystitis, nocturia, breast enlargement, urinary incontinence, hematuria, abnormal ejaculation, genital edema, anorgasmia, penile tissue damage; rare side effects – prolonged erection and/or priapism.
  • Central and peripheral nervous system: very frequent side effects – a headache; frequent side effects – dizziness; rare side effects – drowsiness, headache, ataxia, hypertonia, neuralgia, neuropathy, paresthesia, tremor, vertigo, symptoms of depression, insomnia, abnormal dreams, increased reflexes, hypoesthesia; rare effects – seizures, convulsions, fainting.
  • Skin and subcutaneous tissue disorders: rare side effects – skin rash, urticaria, herpes simplex, pruritus, sweating, skin ulceration, contact dermatitis, exfoliative dermatitis; the frequency is unknown – Stevens-Johnson syndrome, toxic epidermal necrolysis.
  • Other side effects of Viagra: rare effects – a feeling of heat, swelling of the face, photosensitivity reaction, shock, asthenia, fatigue, the pain of various localization, chills, accidental falls, pain in the chest, accidental injury; very rare effects – irritability.

Side effects revealed during post-marketing studies

viagra side effectsCardiovascular complications

During the post-marketing study of Viagra for erectile dysfunction treatment, there were reported such side effects as severe cardiovascular conditions (including myocardial infarction, unstable stenocardia, sudden cardiac death, ventricular arrhythmia, hemorrhagic stroke, transient ischemic attack, hypertension, and hypotension), which seemed to have a temporal association with Sildenafil. The majority of these patients, but not all of them had risk factors for cardiovascular complications. Many of these adverse effects were observed just after sexual activity, and some of them were noted after administration of the drug for men without subsequent sexual activity. It is not possible to detect a direct link between the reported side effects and Viagra intake.

Eyesight disturbances

In rare cases, a post-marketing study of all PDE5 inhibitors, containing Sildenafil, have reported anterior ischemic optic neuropathy – a rare disease and a cause of a decrease or loss of eyesight. Most of these patients had definite risk factors, in particular, the reduction ratio of excavation diameters and the optic nerve discus (“stagnant disc”), the age over 50, diabetes, hypertension, coronary artery disease, hyperlipidemia and detrimental habits, including smoking. The observational study has evaluated whether the recent use of Viagra from Canadian Pharmacy Mall was associated with acute anterior ischemic optic neuropathy. Results indicate approximately a 2-fold increase in risk for anterior ischemic optic neuropathy after administration of the drug. According to the published data, the one-year incidence of anterior ischemic optic neuropathy makes 2.5-11.8 cases per 100 000 men over the age of 50 in the general population. Patients should stop using this medication immediately in case of sudden eyesight loss and consult a doctor. Men who have already suffered from acute anterior ischemic optic neuropathy, have an increased risk of relapse of the disease. Thus, the physician should discuss the risks and the potential chance of adverse effects of the PDE5 inhibitor with his patients. PDE5 inhibitors, including Viagra from Canada, should be used with caution in such patients and only in situations where the expected benefit of the drug outweighs the risks.

* When using ED pills in higher doses than recommended, side effects are similar to those noted above, but usually more pronounced.