Viagra is a drug for erectile dysfunction (ED) which is taken orally. This medication helps a majority of men who suffer from ED to better their penis erections. But acheiving erection is only a half of the job that Viagra do. Keeping erection up is a very important thing as well. So, Viagra helps men in getting erection and maintaining it. As a result, it leads to a more solid sexual performance. It is important to know that Viagra itself doesn’t give erection to men but boosts the natural body processes which result in erection.

Viagra (Sildenafil) effects were found by Pfizer Inc. specialists by accident more than 10 years ago. In the beginning the medication was developed to better blood flow to the heart in angina patients. But the further research showed Sildenafil to work safely and effectively in men with ED. And till now Viagra works perfectly well in men of all ages having erection problems all the time or from time to time.

Chemically, Viagra is the citrate salt of sildenafil, a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5). Sildenafil citrate is denominated chemically as 1-[[3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H- pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-4-methylpiperazine citrate and has the following structural image:

Sildenafil citrate has a form of white crystalline powder with solubility in water of 3.5 mg/ml. It’s molecular weight is 666.7. Viagra as a medication is developed as blue, film-coated rounded tablets containing 25 mg, 50 mg or 100 mg of sildenafil citrate. Viagra pills are taken orally. Additionally, tablets also contain passive ingredients such as: anhydrous dibasic calcium phosphate, microcrystalline cellulose, lactose, magnesium stearate, hypromellose, FD & C Blue #2 aluminum lake, croscarmellose sodium, triacetin, and titanium dioxide.
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