On 6 May , Pfizer , which manufactures Viagra, told the Associated Press they will begin selling the drug directly to people on its site. Viagra is also informally known as “vitamin V”, “the blue pill”, or “blue diamond”, as well as various other nicknames. History Sildenafil compound UK, was synthesized by a group of pharmaceutical chemists led by Simon Campbell [55] working at Pfizer’s Sandwich, Kent , research facility in England. United States Sildenafil is available as a generic drug in the United States, labeled for pulmonary arterial hypertension. Some people may also have ringing in their ears tinnitus or dizziness. The Korean Court system made a ruling against Pfizer in June , allowing for the unhindered domestic production of generic prescription sildenafil.Though Viagra is manufactured by Pfizer, plenty of other companies also make and sell less expensive versions of generic sildenafil pills. What are the side effects and risks of . Pfizer Viagra tablet in the trademark blue diamond shape Sexual dysfunction The primary indication of sildenafil is treatment of erectile dysfunction (inability to sustain a . AdFree & Private Online Consultant with Real Doctors. Reliable E.D. Meds Shipped Discreetly. Save Time & Money with Online Prescription for Viagra, Cialis, Sildenafil and TadalafilK+ visitors in the past monthFree Shipping · Real Doctors · Discreet Packaging · Personalized PlanTypes: Hair Loss · Premature Ejaculation · Sexual Health · Privacy Policy.