Amongst viagra's rare but serious adverse effects are: myocardial infarction priapism, ventricular arrhythmias, severe hypotension, stroke and increased intraocular pressure.
Common side effects include headache, sneezing, flushing, dyspepsia, palpitations, prolonged erections and photophobia. Visual changes including blurring of vision and a curious bluish tinge have also been reported.
Care should be exercised by patients who are also taking Protease inhibitors for the treatment of HIV.
Protease inhibitors inhibit the metabolism of viagra, effectively multiplying the plasma levels of viagra,
increasing
the incidence and severity of side-effects.
It is recommended that patients using protease inhibitors limit their use of viagra to no more than one 25-mg
dose every 48 hours.
Some viagra users have complained of blurriness and loss of peripheral vision. In May of 2005,
the U.S.
Food and Drug Administration found that viagra could lead to vision impairment and a number of studies have
linked viagra use with nonarteritic anterior ischemic optic neuropathy.
When used with an alpha blocker,
take them at least four hours apart to avoid hypotension.
This is not a complete list of all side effects that may occur. If you have questions or need medical advice about side effects, contact your doctor or health care provider. You may report side effects to the FDA
at 1-800-FDA-1088 (1-800-332-1088)
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