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Medicinal products containing sildenafil substance are potent vasodilators. Sildenafil is used to treat erectile dysfunction in men, as well as to normalize the natural response to sexual arousal. The best-known drug Viagra sildenafil is. Moreover, thanks to the effect of sildenafil vasodilator is capable of reducing pulmonary artery pressure, that is used to treat people suffering from pulmonary hypertension. Therefore, the main scope of application Sildenafil - a treatment of erectile dysfunction and pulmonary hypertension.

Any preparation comprising as active ingredient, sildenafil, will possess the same therapeutic effect, giving the same effect. These drugs in the pharmaceutical market are called generics.

The first drug that contains as an active ingredient, sildenafil, Viagra was famous. In principle, Viagra today is produced, but the cost of the original tablet 2 - 4 times higher than its generic. All tablets containing as active ingredient, sildenafil are essentially generic Viagra. Let us consider the generic characteristics and their differences from the original drug. In developing the original drug pharmaceutical company identifies a specific chemical substance, and explores its properties. Tests have been conducted, in which doses this chemical compound has the most pronounced positive and minimum negative effects manifested. Then, a method developed and industrial technology for production of the active substance. Also, at the same time efforts are spent to develop methods of purifying obtained by the chemical impurities that often cause allergic reactions and other serious side effects. After all these steps company-developer releases the drug into the market, which invented the original name. That this is the original product, which is patented. But the validity of the patent for the medication is limited, and is usually from 5 to 10 years. After the expiration of the patent, any other pharmaceutical company can take part of the original drug (written in each instruction) and to do according to the specified dosage own medicine. This name is also thought out his own, and comes to the market a drug with exactly the same active substance, but it is much cheaper. It is a medicine called generics. At the same time generics may be different from the composition of the auxiliary components of the original drug. See also: Viagra.

The Generics is the only similarity with the original drug - is the active substance and its dosage. This is often for their production come from the active substances produced in chemical laboratories by industry, which are not subjected to a serious and thorough clean of impurities. That is a large amount of impurities are referring to pharmacists, speaking about any drug that it is rather "messy". Thus, Viagra for the past period of time there was a large number of generics, whose names are listed in the section above. All of them belong to the sildenafil group. The most pure generic Viagra drugs are Sildenafil Ratiopharm (manufacturer - Croatia) potential and Revatsio (manufacturer - Germany). Less clear, but cheaper generic group is produced by Indian pharmaceutical corporations (Kamagra, Sildalis, Malegra DXT, Silagra, Zenegra, Caverta, Penegra). Indian pharmaceutical companies produce generic sildenafil, which is called soft-tablets. These tablets take just chewing or dissolving, because they do not necessarily need to drink water. Moreover, there are variants of sildenafil in the form of a jelly with different flavors. Jelly Sildenafil tablets and soft-very quickly absorbed into the blood and begin to act much earlier than the classic Viagra. In general, in the world today under the name "Sildenafil" means precisely "Viagra", which has already become a household name. Therefore, in describing the properties of medicines called "Sildenafil" shall mean all Viagra and its many generic.

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