Generic Viagra is a pill for the treatment of impotence. Men of all ages find it very easy to achieve a prolonged erection with generic Viagra. Viagra was developed in the late 90s and today is the leading drug for the treatment of erectile failure. Generic Viagra is chemically known as sildenafil citrate. Today many generic versions of Viagra are available which cost significantly less than the original pill. Moreover, many generic versions of Viagra are also available without a prescription. Viagra was first marketed by the pharmaceutical giant, Pfizer, and is a worldwide top seller. Viagra was initially developed as a drug for the treatment of a specific heart disorder, known as pulmonary hypertension.

During the clinical trials, it was observed that the pill caused erections. Soon after, the pill was mass marketed for erectile failure. Generic Viagra works by increasing blood flow to the penis. The chemical inside Viagra, sildenafil citrate, acts by inhibiting a specific enzyme, which then results in relaxation of the blood vessels. The relaxation of blood vessels results in an increased in blood flow to the penis.
The degree of penile erection is directly related to the amount of enzyme inhibited. Most men require just one pill of generic Viagra to achieve an erection. Generic Viagra must be taken at least 20-30 minutes prior to anticipated intercourse. Generic Viagra is rapidly absorbed from the stomach. To prevent delay or failure of the erection, Viagra must not be taken with fatty foods. Men who want a prolonged erection immediately should also avoid alcohol at the same time as generic Viagra.

There are several other medications related to generic Viagra that also can help men with erectile failure. Levitra, Silagra, and cialis all work similar to generic Viagra; these pills also contain substances that act by inhibiting the enzyme cGMP specific phosphodiesterase. When the enzyme phosphodiesterase is inhibited, there is an increase in nitric oxide. This potent gas has the ability to relax smooth muscle and opens up the blood vessels. The relaxation of the blood vessel results in increased blood flow to the penis. Nitric oxide has a very short half-life and thus the effects of generic Viagra are not sustained for more than 2-6 hours. Because Viagra has the ability open up blood vessels it is also frequently used in the treatment of certain heart disorders where blood flow to the lungs is compromised. Individuals who have narrowed or small blood vessels in the lung often are short of breath and blue. Viagra can significantly improve their well-being when the pill is taken on a regular basis. Generic Viagra is broken down in the body by enzymes in the liver and excreted by the liver and kidneys. Most of the Viagra is excreted within 4-12 hours.
Other groups of individuals who also benefit from Viagra are those who have chronic depression. Impotence is a common side effect of depression. Depressed individuals can find significant improvement in their sex life after taking Viagra.
Other medical uses of generic Viagra is for individuals who develop high altitude sickness. Some individuals who climb mountains or hike up hills, often develop altitude sickness which is marked by shortness of breath and cough. These individuals can significantly benefit by taking generic Viagra for the duration of the trip.

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