Viagra is perhaps the mostly widely used pharmaceutical brand name in the world. Chemically Viagra is Sildenafil Citrate. The blue pill (so named for its distinctive blue colour) was initially tested as an anti-hypertensive and for treating angina pectoris. However once Pfizer had discovered its effectiveness in treating erectile dysfunctions it was immediately marketed as a drug for treating erectile dysfunction.
Source: http://articlewisdom.com
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