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Viagra sildenafil relaxes muscles found in the walls of blood vessels and increases blood flow to particular areas of the body.
The penis is one of the areas where this enzyme works. Erectile dysfunction is a condition where the penis does not harden and expand when a man is sexually excited, or when he cannot keep an erection.
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All men with ED should consult their doctor before obtaining erectile dysfunction medication online. Viagra works by increasing blood flow to the penis which helps men get and sustain europe viagra online erection long enough for sex. Sildenafil inhibits blocks an enzyme which regulates blood flow in the penis.
Sildenafil acts by blocking phosphodiesterase 5 PDE 5, an enzyme that promotes breakdown of cGMP, which regulates blood flow in the penis. Pfizer originally discovered the medication in while looking for a treatment for angina. The primary indication of sildenafil is treatment of erectile dysfunction inability to sustain a satisfactory erection to complete sexual intercourse.
Its use is now one of the standard treatments for erectile dysfunction, including for men with diabetes mellitus. Tentative evidence suggests that sildenafil may help men who experience antidepressant -induced erectile dysfunction. While sildenafil improves some markers of disease in people with pulmonary arterial hypertension, it does not appear to affect the risk of death or serious side effects.
Sildenafil and other PDE5 inhibitors are used off-label to alleviate vasospasm and treat severe ischemia and ulcers in fingers and toes for people with secondary Raynaud's phenomenon ; 9 22 these drugs have moderate efficacy for reducing the frequency and duration of vasospastic episodes. Sildenafil has been studied for high-altitude pulmonary edema, but its use is currently not recommended for that indication.
In clinical trials, the most common adverse effects of sildenafil use included headache, flushing, indigestion, nasal congestion, and impaired vision, including photophobia and blurred vision. Patients thus taking the drug may experience colorvision abnormalities. Some complained of blurriness and loss of peripheral vision. Rare but serious adverse effects found through postmarketing surveillance include prolonged erections, severe low blood pressure, myocardial infarction heart attack, ventricular arrhythmias, stroke, increased intraocular pressure, and sudden hearing loss.
Care should be exercised by people who are also taking protease inhibitors for the treatment of HIV infection. Protease inhibitors inhibit the metabolism of sildenafil, effectively multiplying the plasma levels of sildenafil, increasing the incidence and severity of side effects. Those using protease inhibitors are recommended to limit their use of sildenafil to no more than one 25 mg dose every 48 hours.
Contraindications include: 4. Sildenafil should not be used if sexual activity is inadvisable due to underlying cardiovascular risk factors. Sildenafil's popularity with young adults has increased over the years. Golombek of Universidad Nacional de Quilmes, Argentina, for their discovery that sildenafil helps treat jet lag recovery in hamsters.
Professional athletes have been documented using sildenafil, believing the opening of their blood vessels will enrich their muscles. Acetildenafil and other synthetic structural analogs of sildenafil which are PDE5 inhibitors have been found as adulterants in a number of herbal aphrodisiac products sold over-the-counter. However, at least one court case has resulted in a product being taken off the market. Food and Drug Administration FDA has banned numerous products claiming to be Eurycoma longifolia that, in fact, contain only analogs of sildenafil.
Nitric oxide NO in the corpus cavernosum of the penis binds to guanylate cyclase receptors, which results in increased levels of cGMP, leading to smooth muscle relaxation vasodilation of the intimal cushions of the helicine arteries. This smooth muscle relaxation leads to vasodilation and increased inflow of blood into the spongy tissue of the penis, causing an erection.
Furchgott, Ferid Murad, and Louis Ignarro won the Nobel Prize in Physiology or Medicine in for their independent study of the metabolic pathway of nitric oxide in smooth muscle vasodilation. This kinase is activated by cGMP and it phosphorylates multiple targets in the smooth muscle cells, namely myosin light chain phosphatase, RhoA, IP3 receptor, phospholipase C, and others.
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