All Pfizer produced Viagra medications come fully approved by the US Food and Drug Administration (FDA), meaning that they are suitable to be sold online through a pharmacy website, for use to treat the common male problem of erectile dysfunction.
Before it could be sold to the public, a full gamut of Viagra medications had to be tested extensively in clinical trials, so this was carried out in the nineteen-nineties by Pfizer, who monitored over 3000 subjects under carefully controlled conditions and situations while they took the drug of Sildenafil Citrate (the active ingredient in Viagra) – trials which included some subjects from all across the world who took Viagra medicine for more than a year, and others who unwittingly were given placebo pills containing no Sildenafil Citrate at all; a practice which is normal for clinical trials of this nature.
The side effects discovered during this time were minimal and well within normal parameters for all drugs which are marketed to the general public – while the positive effects of Sildenafil Citrate on the problem of erectile dysfunction was widespread, which is why the drug was then made available to purchase by Pfizer under the trade name of Viagra. Its subsequent safe use by millions of men has meant that Viagra has become a hugely recognizable tablet over the fourteen years since it first appeared in pharmacies.
It works very effectively as a suppressant of an enzyme in the male body known medically as PDE-5. This enzyme is responsible for regulated and allowing blood to flow out of the penis during an erection, in order to let the penis to relax and become flaccid, as is normal post-coitally. Men suffering from ED, or erectile dysfunction – be it temporarily, just the once, or long-term – have this happen to them even when desire and arousal is high, which can cause significant emotional and mental anguish. By taking Viagra, patients of this kind can effectively treat the problem, in a very discrete and easily performed fashion.
To take Viagra med, one tablet is ingested orally from anywhere between half an hour to four hours before sex is desired. Depending on the severity of the condition, Viagra medications come in three different sizes: 100mg, 50mg or 25mg. Once taken, Viagra allows normal erectile performance for in the region of two hours.