Viagra
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What is Viagra (Sildenafil)?
Viagra is used to treat impotence in men. Viagra increases the body's ability to achieve and maintain an erection during sexual stimulation. There are only three oral drugs approved by the FDA to treat erectile dysfunction: Cialis, Levitra, and Viagra. All work by increasing the flow of blood into the penis so that when a man is sexually stimulated, he can get an erection, but the best prescripted dor erectile disfunction is Viagra. Sildenafil is used to treat high blood pressure in the lungs (pulmonary arterial hypertension) by blocking a certain enzyme (phosphodiesterase-PDE5) in the body. Order Viagara Online, works by relaxing the blood vessels in the lungs and the rest of the body. Sildenafil is also available in other strengths for treating erectile dysfunction in males,do not substitute one form of this drug for the other. Order viagra online and use this medication regularly in order to get the most benefit from it. Before you order viagra online, tell your doctor, pharmacist, our use online support if you are allergic to it; or if you have any other allergies, because it can give side effects combined with other medicine. viagra is a drug used to treat male erectile dysfunction (impotence) and pulmonary arterial hypertension (PAH), developed by the pharmaceutical company Pfizer.
How does Viagra work?
When sexual stimulation and arousal occur, they cause a chemical called cyclic GMP to be produced. Cyclic GMP creates erections by causing the arteries of the penis to expand and the veins to narrow. In other words, it creates a "traffic jam" of blood in the penis with blood entering faster than it leaves. That's what causes the penis to get hard. Part of the 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. Viagra stops an enzyme that attacks cyclic GMP, so more cyclic GMP can accumulate in the man's penis. With more cyclic GMP present it causes the normal expanding of the arteries and narrowing of the veins which produces an erection. Order Viagra Online, 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, viagra (sildenafil) should not cause an erection. Viagra is metabolised by hepatic enzymes and excreted by both the liver and kidneys. If taken with a high-fat meal, there may be a delay in absorption of viagra and the peak effect might be reduced slightly as the plasma concentration will be lowered.
Viagra Dosage
The dose of Viagra (sildenafil) is 25 mg to 100 mg taken not more than once per day between 30 minutes and 4 hours prior to sexual intercourse. It is usually recommended to start with a dosage of 50 mg and then lower or raise the dosage as appropriate. Order viagra online, soldd in three dosages (25, 50, and 100 mg), all three costing about US$10 per pill. Name-brand Viagra sildenafil is not scored and a fairly hard coating makes it more difficult to accurately cut the pills in half, even with a pill cutter.
How do I recognise Viagra pills?
Viagra pills are blue and diamond-shaped with the words "Pfizer" on one side, and "VGR 25", "VGR 50", "VGR 100", the dose of that pill in milligrams on the other. Viagra is a registered name by by the pharmaceutical company Pfizer. Be carefull when you order viagra online to have Pfizer company as supplier.
Is Viagra Safe to use?
The drug was patented in 1996, approved for use in erectile dysfunction by the Food and Drug Administration on March 27, 1998, becoming the first pill approved to treat erectile dysfunction in the United States, and offered for sale in the United States later that year. Lately it was approved by EU in Europe and you safely order viagra online.
More Viagra Information:
The physiologic mechanism of viagra involves the release of nitric oxide (NO) in the corps cavernosum during sexual stimulation. NO then activates the enzyme guanylate cyclase, which results in increased level of cyclic guanosine monophosphate (cGMP), producing smooth muscle relaxation in the corpus carvernosum and allowing inflow of blood. You use Viagra as one tablet once a day, about 1 hour before sexual activity. If you have erectile problems order viagra online. However, Viagra may be taken anywhere from 30 minutes to 4 hours before sexual activity.Order Viagra Online has no direct relaxing effect on isolated human corpus cavernosum, but enhances the effect of NO by inhibiting phosphodiesterase type 5 (PDE5), which is responsible for degradation of cGMP in the corpus cavernosum. When sexual stimulation causes local release of NO, inhibition of PDE5 by Viagra causes increased levels of cGMP in the corpus cavernosum, resulting in smooth muscle relaxation and inflow of blood to the corpus cavernosum. Order Viagra Online safely, as recommended doses has no effect in the absence of sexual stimulation. Store at room temperature at 77 degrees F (25 degrees C) away from light and moisture. Brief storage between 59-86 degrees F (15-30 degrees C) is permitted. Do not store in the bathroom. Order viagra online, and take full benefits of viagra pill. Keep all medicines away from children and pets. Properly discard this product when it is expired or no longer needed. Don`t order viagra online if you have suffered from a heart attack, stroke or life threatening arrhythmia within the last 6 months you should discuss other options with your doctor.
