For over 15 years Viagra has remained the most prescribed drug for erectile dysfunction treatment in more than 120 countries in the world. Despite the availability of several different drugs to treat erectile dysfunction, Viagra sales continue to grow steadily. In 2012 Viagra sales reached US$ 1.135 billion in the USA, and total sales of Viagra around the world first exceeded US$ 2 billion.
Incredible popularity of Viagra is caused by the fact that namely this drug was able to change the men's attitude and perception to ED problem. Before Viagra tablets went on sale, there was none of oral drugs for ED treatment with proven clinical efficacy.
Use of Viagra drug helps to restore the ability to achieve an erection regardless of ED cause, associated risk factors, man's social status and age. So, in the absence of contraindications, the only thing that can limit the possibility of buying Viagra pills is their relatively high cost.
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Mechanism of Viagra action
Each Viagra pill contains an active pharmaceutical ingredient Sildenafil which has pharmacological property to increase natural physiological processes that provide a sufficient blood flow to the penis. Namely intensive blood supply in erectile tissue of the penis provides an erection during male sexual arousal.
Given that Sildenafil is not a sexual stimulant, it provides blood flow to the erectile tissue only in response to sexual stimulation of the penis. If a man is able to achieve an erection but he is not satisfied with its quality, Sildenafil can increase blood flow to the penis in response to visual sexual stimuli.
Contraindications for Viagra use
Viagra pills should not be prescribed to treat sexual dysfunction in men: under 18 years; who take organic nitrates; with diagnosed hypersensitivity to Sildenafil. Women, and adolescents under 18 years were not involved in pre-clinical, clinical and post-marketing studies of Viagra drug.
Viagra side effects
Results of clinical studies showed that the most common Viagra side effects include headache, dyspepsia, redness of the face. Less common Viagra side effects are: stuffy nose, diarrhea and reversible change in color perception. In vast majority of men Viagra side effects are weakly expressed, so they do not cause emotional and physical discomfort during sexual intercourse.
Recommended Viagra dosage
Viagra pills at the international pharmaceutical market
Viagra has become the world's first oral drug approved by the FDA for the treatment of erectile dysfunction. The USA was the first country where Viagra drug has been available in retail sale. U.S. pharmaceutical market is the largest in the world. So, it is not surprising that more than half of the total Viagra sales is registered in the USA.
Despite the fact that besides Viagra, other oral drugs are also available in sale for erectile dysfunction treatment, sales of Viagra pills annually grow. In 2012, Viagra sales all over the world reached $2 billion. However, many experts express their opinion that sales of Viagra pills will start to decrease in 2013.
Reduction of Viagra sales can be due to the increase of competition from the cheaper Viagra generic drugs. For several years, in most of the EU member states Viagra generic drugs have been available for sale and their cost is much more lower than Viagra pills (Pfizer manufacturer).
In European countries, Viagra generics are available for sale under generic name Sildenafil and original trade names: Amfidor, Sildafil, Ecriten, Arifil, Licosil, Erasilton, Sildeagil, Falsigra, Sildenamed, Sildifil, Sildogen, Sildrem, Silfchemia, Silkodil, Silmen, Silobel, Fildlata, Sinegra, Valedonis, Vizarsin, Lekap, Zildrem, Rosytona, Silderec, Vilgendra, Yextor.
Viagra generic drugs are sold not only in Europe, but also in Mexico under original trade names: Lerk Jet, Apodefil, Sforza, Go, Visdonec, Silcarex, Sindebax, Bullenza, Exzalte, Mazzogran, G4, Patrex. One of the few countries where Viagra generic drugs are not yet available is the USA.
It is noteworthy that several pharmaceutical companies (Teva, Watson, Hetero Labs, Apotex, Mylan, Actavis, Amneal) have been trying to get a trade license for sale Viagra generic drugs in the USA over several years.
However, Pfizer claims that these companies cannot sell Viagra generic drugs in the USA, in doing so they will violate patent law. The court will make a final decision on when the first generic drugs will go on sale in the USA.
Today Pfizer company is the only manufacturer of oral pills, containing Sildenafil citrate which has the trade license for their sale in the USA. Therefore, Pfizer is a natural monopolist in this segment of pharmaceutical market. Correspondingly, price for Viagra pills in the USA remains relatively high.
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