How is Viagra Helpful To YOU ?

What is Viagra?
Viagra(Sildenafil citrate), sold under the names Viagra, Revatio and generally under various other names, is a drug used to treat male of erectile dysfunction (impotence)developed by the pharmaceutical company Pfizer. The other medicines which can support for sexual activity are Vardenavil(Levitra) and Tadalafil (Cialis).

How are Viagra, Levitra and Tadalafil work?
Viagra,Levitra and Tadalafil are prevent the breakdown of nitric oxide , chemical messenger that promotes relaxation and opening of the blood vessel supply erectile in the penis. Under the influence of nitric oxide, these vessel expand an stay dilated. Increased blood flow makes erectile tissue swell and compress the veins that carry blood out of the penis, resulting in a full erection.
This medicines till now still helpful and many men looking for it used for increase them sexual activity. Many men who have no sexual disorder also using for to take longer them sexual activity, so it is useful for man who have no sexual problem?

What is Viagra recommended for?
Viagra is a recommended only for who everyone have sexual activity problem, especially erectile dysfunction, so for man who have no sign and symptom of sexual activity erectile dysfunction will not take effect for it, even take effect the effect will not significant but sometimes makes forth serious problem, so don,t used Viagra without doctor recommended or prescribed. In testing researches found that men with Diabetes or who had undergone radical prostate surgery were less likely to benefit. The drug also should not be taken with nitroglycerin and patches.
Dr. Harin Padma - Nathan of University of Southern California s or said," This drug does not change libido or desire and it,s not going to have any impact on normal men, so this drug is only effective in men with sexual dysfunction and should be prescribed as an"aphrodisiac" in healthy men.

Dosage
As with all prescription drug, proper dosages is at the discretion of a licensed medical doctor. The tho of sildenafil is 25 mg to 100 mgtaken once per day between 30 minute and an hour prior to sexual activity. The best way is consulting with your doctor first to avoid problem or worse side effect.

Contraindication:
Contraindication include are:

• When taking nitric oxide donors, organic nitrites and nitrates, such as glyceryl trinitrate (nitroglycerin), sodium nitroprusside , amyl nitrite (poppers).
• In men for whom sexual intercouse is inadvisable due to cardiavascular risk factors.
• Severe hepatic impairment (decresed liver function).
• Severe inpairment in renal function.
• Hepertension (High blood pressure) and Hypotension (Low blood pressure).
• Recen stroke or heart attack.
• Hereditary degenerative retinal disorders (including genetic disorders of retinal phosphodiesterasess).

Side effects
Among sildenafil's serious adverse effects are : priapism, severe hypotension myocardial infarction, ventricular arrhythmias,sudden death, stroke, and increased intraocular pressure.
Common side effects include sneezing, headache, flushing, dypspepsia, prolonged erection, palpitation, and photophobia. Visual chnages including blurring of vision and a curious bluish tinge have also been reported.

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Referencies:
Wikipedia
Medicines info
Yahoo.health