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Viagra (Sildenafil Citrate)

It has been established that 140 million men worldwide suffered from impotence affects and half from them are thought to have some physical (medical) cause which include diabetes and circulatory, neurological or urological conditions. Oters are believed to have psychogenic causes of impotence. The engorgement of the penis with blood leads to penile erection. This engorgement appears in case of delivering blood to the penis by the blood vessels which results to extending in size and increasement the delivery of blood to the penis. Under normal conditions, sexual stimulation provoke the production and release of nitric oxide in the penis. Nitric oxide then activates the enzyme, guanylate cyclase, which causes the production of cyclic guanosine monophosphate (cGMP). This enzyme is necessary for the erection by affecting the quantity of blood that the blood vessels deliver and remove from the penis. Sildenafil (Viagra) also decreases the pressure in the pulmonary artery in a serious condition called pulmonary arterial hypertension. By blocking an enzyme called phosphodiesterase-5 (PDE5) which destroys the cGMP sildenafil (Viagra) averts the destruction of cGMP and allows cGMP to accumulate and persist longer. This situation leads to more prolonged engorgement of the penis.

Viagra (Sildenafil Citrate) is a blue, film-coated, rounded, diamond-shaped tablets that released in 25, 50, and 100 mg tablets for the treatment of impotence. Revatio released in a 20 mg tablet and is applied for treating pulmonary arterial hypertension.

Tablets should be stored at room temperature, 15- 30°C (59-86°F).

Tadalafil is applied for the treatment of impotence.

Sildenafil (Viagra) is rapidly absorbed. The maximum concentrations are reached within 30 to 120 minutes (median 60 minutes) of oral dosing in the fasted state. In case of taking sildenafil (Viagra) with a high fat meal, the rate of absorption is decreased and achievement of the maximal concentration occurs on one hour later.

Sildenafil (Viagra) extends the effects of the blood pressure lowering medications including nitrates, e.g. isosorbide dinitrate (Isordil), isosorbide mononitrate (Imdur, Ismo, Monoket), nitroglycerin (Nitro-Dur, Transderm-Nitro) that are accepted primarily for treating angina. Patients taking nitrates shouldn't consume sildenafil (Viagra). Cimetidine (Tagamet), erythromycin, ketoconazole (Nizoral), itraconazole (Sporanox) and mibefradil (Posicor) can lead to enlarge sildenafil (Viagra) in the body. In case of using these drugs patients should be observed carefully if sildenafil (Viagra) is accepted. It is known that rifampin can reduse blood levels of sildenafil (Viagra) and probably diminish its effectiveness.

Viagra can be bought from the local pharmacy or from an online website. Though it has only been recently introduced in the market, Viagra drug is referred to as the miracle pill for men and is taken regularly especially by those who practice regular sex. This affects its production and more and more online pharmacies are being created to meet the demand for the drug. An option where to buy Viagra cheap is straight from the manufacturer. You can buy Viagra online by bulk but you have to first secure a certification as an authorized dealer. Buying wholesale will give you big discounts from the manufacturer. These manufacturing plants also have its own standards for the Viagra tablet such that any deformed or imperfectly cut tablet will be rejected and discarded. These Viagra tablets are then sold and offered in the market by some free agents for a lower price. You can buy Viagra cheap from an online pharmacy website. Not only does it come with big discounts but there are also promos where in they gave it away for free. These online pharmacy stores are popular because of the convenience in shopping for the Viagra drug. By merely typing the word Viagra in the search bar and a couple of websites are already within reach for the drug.