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What is E.D?

Erectile dysfunction is the frequent or consistent inability to get or sustain an erection of the penis sufficient to engage in sexual intercourse. While most men occasionally fail to get an erection, or lose one prematurely during sexual activity, some men suffer from these problems regularly.

Accurate statistics are lacking on how many men are affected by the condition, but some doctors estimate that about half of men aged 40 to 70 have frequent problems achieving or maintaining an erection. The number of men with erectile dysfunction is low for those under the age of 40, but it increases with age.

ED is a condition during which a penis does not get enough rigidness, or erection does not last long enough for a satisfying sexual intercourse to happen. Problems with erection that persist at least 6 months are a clear symptom of ED.

What is viagra?

Viagra is the brand name for Sildenafil citrate, and is used for treating erectile dysfunction and pulmonary arterial hypertension. Originally developed by scientists in Great Britain, it was brought onto the market by Pfizer Inc

Viagra works by inhibiting an enzyme called cGMP-specific phosphodiesterase type 5, that delays degradation of cGMP, which controls blood flow in the penis. It came onto the market in 1998 and has become the prime treatment for impotence (erectile dysfunction). Viagra's main competitors are Cialis (tadalafil) and Levitra (vardenafil).

How to take it?

Using sildenafil, you may only get an erection if you are sexually excited. Viagra is taken as needed, no oftener than a single tablet per 24 hours. Take a single pill 30-60 minutes before the planned sex, with or without water, on a full or an empty stomach (but avoid eating fat meals since it may decrease the effectiveness). Do not take more than 5 units of alcohol (for example, five glasses of wine) when using Viagra.

VIAGRA (sildenafil citrate) helps the penis fill with enough blood to cause an erection. After sex is over, the erection goes away.

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Dosage Viagra, for erectile dysfunction, comes in blue, diamond-shaped pills, in doses of 25, 50, or 100 milligrams. The patient takes a maximum of one pill in a 24-hour period, between 30 minutes to 1 hour before sexual intercourse. Revatio, for pulmonary arterial hypertension, comes in white, round, film-coated tablets. Patients take one 20 mg Revatio tablet three times a day. Adverse events According to clinical trial results, the most common side effects include headaches, nasal congestion, impaired vision, photophobia, and dyspepsia. Less commonly, some users experienced cyanopsia (everything had a tinted blue tinge). In very rare cases it can lead to vision impairment and nonarteritic anterior ischemic optic neuropathy. Postmarketing surveillance side effects have included (very rare) priapism, heart attack, sudden hearing loss, increased intraocular pressure, and ventricular arryhythmias. Since 2007, in the USA its labeling has included a warning of the potential risk of sudden hearing loss. Viagra can decrease blood supply to the optic nerve, causing sudden vision loss. This very rare adverse event occurred mainly to patients who had heart disease, hypertension, diabetes, high cholesterol, or pre-existing eye problems. Nobody really knows whether the vision loss was caused by the Viagra. Interactions - HIV patients on protease inhibitors should discuss using Viagra with their doctors - protease inhibitors increase the likelihood and severity of side effects. Experts say such patients should have no more than 25mg, and not more often than every 48 hours. If the patient is taking alpha blockers, make sure they take that medication and Viagra at least four hours apart, to prevent low blood pressure. Contraindications - the following individuals should not take Viagra (or check with their doctors first): Those on nitric oxide donors, nitrates and organic nitrites Men who are advised to refrain from sexual intercourse because of a cardiovascular risk factors Patients with severe hepatic impairment Patients with kidney disease Individuals with low blood pressure (hypotension) Those who had a recent heart attack Those who had a recent stroke Individuals with hereditary degenerative retinal disorders


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