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Viagra is the brand name for sildenafil citrate and used for the treatment of erectile disfunction, otherwise known as male impotence. Generic Viagra is the same Sildenafil Citrate but marketed under different brand names and often at lower prices. Generic versions of brand name drugs have existed for a long time, but the generic version of Viagra is relatively new and brings new possibilites for affordable impotence treatment. You can expect generic Viagra to work in the same way as brand name Viagra because they contain the exact same active ingredient (Sildenafil Citrate). If Viagra is safe for you (as decided by your doctor) Generic Viagra is also safe for you and should be taken in the same doses as prescribed by your doctor.

When sexual stimulation begins nitric oxide (NO) is released into the spongy tissue of the penis. NO then activates an enzyme that increases the production of cyclic guanosine monophosphate (cGMP) the substance that relaxes the spongy tissue of the penis and facilitates an influx of blood. As specific enzymes slowly degrade cGMP the penis will slowly loose its ability to sustain an erection. Viagra works by inhibiting those enzymes that degrade cGMP, thereby enhancing ones ability to obtain and sustain an erection. VIAGRA enables many men with erectile dysfunction to respond to sexual stimulation. When a man is sexually excited, VIAGRA helps the penis fill with enough blood to cause an erection. After sex is over, the erection goes away.

Over 21 studies have been done to evaluate the efficacy of Viagra. Evaluation of drug activity was most often done using a self-assessment questionnaire. During a 6-month open labeled study, Viagra was found to improve sexual function in 88% of those treated. This included frequency, firmness, and maintenance of an erection; frequency of orgasm; frequency and level of desire; frequency, satisfaction and enjoyment of sexual intercourse; and overall relationship satisfaction.

This medicine can help many erectile dysfunction or male impotence sufferers when it is used as prescribed by their doctors. However, Viagra is not for everyone. It is intended for use only by men who have erectile disfunction. Viagra must never be used by men who are taking medicines that contain nitrates of any kind, at any time. This includes nitroglycerin. If you take Viagra with any nitrate medicine your blood pressure could suddenly drop to an unsafe or life threatening level.

Viagra is a pill used to treat erectile dysfunction or male impotence in men. It can help many men who have erectile dysfunction get and keep an erection when they become sexually excited (stimulated). You will not get an erection just by taking this medicine. Viagra helps a man with erectile dysfunction get an erection only when he is sexually excited.

When a man is sexually excited, the penis rapidly fills with more blood than usual. The penis then expands and hardens. This is called an erection. After the man is done having sex, this extra blood flows out of the penis back into the body. The erection goes away. If an erection lasts for a long time (more than 6 hours), it can permanently damage your penis. You should call a doctor immediately if you ever have a prolonged erection that lasts more than 4 hours. Some conditions and medicines interfere with this natural erection process. The penis cannot fill with enough blood. The man cannot have an erection. This is called erectile disfunction if it becomes a frequent problem.