<\/a>\n<\/div>\nSildenafil citrate, sold under the brand name Viagra is a prescription drug used to treat erectile dysfunction and pulmonary arterial hypertension. Originally discovered by Pfizer scientists Nicholas Terrett, David Brown and Andrew Bell; the drug is marketed in Australia\u00a0and abroad since becoming widely available in 1998. Viagra pills are diamond shaped, periwinkle blue and have the word Pfizer imprinted on one side of the pill. On the other side of the pill is imprinted “VGR 25, 50 or 100,” indicating the dosage. Marketed as an effective treatment for sexual dysfunction, this medication successfully remedies the inability to sustain a sufficient erection for intercourse. The drug works by facilitating the relaxation of smooth muscles in the arteries of the penis. Thus dilation of the blood vessels in the penis occurs, which cause engorgement of the organ. The drug also reduces refractory time until another erection can occur. Especially useful for patients experiencing sexual dysfunction due to antidepressant usage, this drug is often prescribed as adjunctive therapy once the side-effect of sexual dysfunction becomes problematic for the patient.<\/p>\n
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