Viagra is the brand name under which the medication Sildenafil is sold. Sildenafil, or Viagra, is a medication used to treat erectile dysfunction, as well as pulmonary arterial hypertension.
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Viagra was originally discovered by a group of scientists working for Pfizer, while working on treatments for various cardiovascular diseases. However, its use as a treatment for erectile dysfunction proved to be a far more popular and lucrative benefit than its use in treatment of pulmonary arterial hypertension.
Of note in terms of Viagra’s use is that it may also be used to improve risk factors for high altitude pulmonary edema, or altitude sickness, although it is not confirmed whether or not it actually affects the rate of the condition itself. Viagra also is used specifically to treat sexual dysfunction in men who are taking ant-depressants, and are experiencing sexual dysfunction due to their usage of antidepressants.
In clinical trials prior to Viagra’s introduction to the market, the most common side effects were headaches, flushing, nasal congestion, impaired vision, and indigestion. There were some reports by Viagra users of seeing everything tinted blue, a condition known as cyanopsia. In 2005, the U.S.A. Food and Drug Administration (FDA) concluded that in some rare cases, Viagra could lead to vision impairment, and some studies have linked Viagra use with non-arteritic anterior ischemic optic neuropathy, a condition causing loss of vision due to damage to the optic nerve due to insufficient blood supply.
In some rare cases noted after Viagra began to be sold, some users observed prolonged erections, severe low blood pressure, heart attack, ventricular arrhythmias, stroke, and sudden hearing loss. These reports, for Viagra and other similar medications, caused the FDA to announce that all drugs in Viagra’s class to be prominently labeled as having the risk for sudden hearing loss.
There are several interactions one should note among users of Viagra. Those taking protease inhibitors for the treatment of HIV infection should be especially wary, as protease inhibitors significantly increase the incidence and severity of side effects when taking Viagra. Other drugs that interfere with Viagra are erythromycin (used to treat bacterial infections, including many common STIs) and cimetidine (used to treat heartburn and stomach ulcers). Users of Viagra should not mix Viagra use with nitrates and nitric oxide donors, such as nitroglycerin and alkyl nitrates (known as “poppers”), as combined usage can lead to increased risk of cardiovascular incidents.
The primary competitors for Viagra are the drugs tadalafil and vardenafil, which are sold under the trade names Cialis (for tadalafil) and Levitra (for vardenafil). All three of these drugs function in similar manners chemically, although their usage patterns are slightly different in some cases. These drugs are referred to as PDE5 inhibitors.
Viagra is a legal and recognized drug in Australia, and is obtainable in Australia without the need for a doctor’s prescription. A number of sites offer Cialis to Australians, such as http://edonlinestore.net.
Prices for Viagra vary, but in terms of online access for Australians, it can be found for anywhere from about $0.50AU for generics to $3-4AU for name brand pills, as price per unit value. Generally, one buys multiple pills per order, rather than buying single pills, but single pills are accessible if so desired. Viagra generally tends to be the least expensive for Australian consumers when compared with Cialis or Levitra.
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