Viagra is an oral therapy used for the treatment of erectile dysfunction.Viagra contains the citrate salt of Sildenafil,a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5).Sildenafil Citrate is a discrete pill used for the treatment of male impotence which is often called as erectile dysfunction.
Sildenafil Citrate is a real breakthrough treatment that can help many men who have erectile dysfunction to get and keep an erection when they are sexually aroused.
Sildenafil relaxes muscles and increases blood flow to particular areas of the body.
Sildenafil Citrate ® helps men with ED respond to sexual stimulation. When sexually excited, this drug allows the arteries in the penis to relax and enlarge, thereby allowing the flow of blood into the penis.When the arteries in the penis expand and harden the veins that carry blood away from the penis compress restricting the flow of blood out of the penis. This mechanism is controlled by Sildenafil Citrate ® which controls the flow of blood out, thereby resulting in an erection.
Sildenafil citrate is available here as Sildenafil Citrate 100mg and Sildenafil Citrate 50mg. So buy Sildenafil citrate now.

How does Sildenafil Citrate works?

Sildenafil citrate works by blocking a chemical that causes blood to flow out of the penis.
More blood in the penis means an improved erection.physiological process of erection involves the parasympathetic nervous system causing the release of nitric oxide (NO) in the corpus cavernosum of the penis. NO binds to the receptors of the enzyme guanylate cyclase which results in increased levels of cyclic guanosine monophosphate (cGMP), leading to smooth muscle relaxation (vasodilation) of the intimal cushions of the helicine arteries, resulting in increased inflow of blood and an erection.Sildenafil is a potent and selective inhibitor of cGMP specific phosphodiesterase type 5 (PDE5) which is responsible
for degradation of cGMP in the corpus cavernosum. The molecular structure of sildenafil is similar to that of cGMP and acts as a competitive binding agent of PDE5 in the corpus cavernosum, resulting in more cGMP and better erections.Without sexual stimulation, and therefore lack of activation of the NO/cGMP system, sildenafil should not cause
an erection. Other drugs that operate by the same mechanism include tadalafil (Cialis) and vardenafil (Levitra).When a man is sexually aroused, the arteries in the penis relax and widen, allowing more blood to flow into the penis. As the arteries in the penis expand, the veins that normally carry blood away from the penis become compressed,restricting the blood flow out of the penis. With more blood flowing in and less flowing out, the penis enlarges, resulting in an erection. If the nerves or blood vessels associated with this process aren’t working properly,a man may not be able to get an erection. Sildenafil Citrate increases blood flow to the penis, so that when a man is sexually aroused, he can get and keep an erection.

How and when to Take Sildenafil Citrate?
Here are some general suggestions for how and when should one take sildenafil citrate:
* Sildenafil citrate comes in tablet form. It is taken usually one hour before sexual activity. However, it is recommended that you should take sildenafil citrate once in 24 hours.
* sildenafil citrate dose should be taken with a glass of water. It can be taken with or without food. If you take sildenafil citrate dose with food, it should be kept in mind that fatty meals may decrease the levels of sildenafil citrate in the blood.

* Do not break, chew, or crush the sildenafil citrate tablets.
* For sildenafil citrate to work properly, you have to take it as prescribed. Sildenafil citrate will not work if you stop taking it.

Sildenafil Citrate: Dosing
The dose of sildenafil citrate your healthcare provider recommends will vary depending on a number of factors, including:

• Your age
• Other medical conditions you may have
• Other medications you may be currently taking.

As always, do not adjust your dose unless your healthcare provider specifically instructs you to do so.

Sildenafil Citrate Side Effects

There are many possible side effects with sildenafil citrate. However, most of the people who takes sildenafil citrate
will experience no side effects.

The most common sildenafil citrate side effects include:

* Headache –14 percent of people
* Facial flushing — 9 percent of people
* Indigestion, known as dyspepsia — 8 percent of people
* Nasal congestion — 4 percent of people
* Urinary tract Infections (UTI) — 3 percent of people
* Vision problems, including trouble telling the difference between blue and green, increased sensitivity to light, or blurred vision — 3 percent of people
* Diarrhea — 3 percent of people
* Dizziness — 2 percent of people
* Unexplained rash — 2 percent of people.
There are two other rare side effects to be aware of. If you have a heart or blood vessel disease (cardiovascular disease) or significant heart disease risk factors, you will have an increased chance of developing serious problems with the heart, brain, and blood vessels. These problems can result in a heart attack, stroke, or sudden death.

In people taking sildenafil citrate or other PDE5 inhibitors, there have been rare cases of a condition called non-arteritic anterior ischemic optic neuropathy (NAION). This condition can lead to sudden loss of vision in one or both eyes. If you experience any loss of vision while taking sildenafil citrate, contact your healthcare provider immediately (see Viagra and Blindness).