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Sildenafil Citrate (Viagra) is the oldest, most popular and most controversial among the three PDE5 (Phosphodiesterase Type 5) inhibitors. The market launch of the diamond blue pill is five years earlier than Cialis and seven years earlier than Levitra. In the first years of its market dominance, the pill has an obvious monopoly of the anti-impotency drug market.

However, the market share has plummeted because of competitions from the other two newer erectile dysfunction medicines and the arrival of Generic Viagra in the online pharmacy market. This is the reason why Pfizer (maker of Viagra) has started focusing its attention on Revatio, the anti-PAH (pulmonary arterial hypertension) version of Viagra.

Because the blue diamond pill did not have a competitor for almost half a decade, the brand has gained popularity all over the world. Without any special favor from company agents, the name of the blue pill has been a favorite material for bar room and comedy show jokes. In the United States and some Southeast Asian countries, Viagra has been embedded in popular culture that one can say it has achieved the status of a celebrity. The well-known endorsers of the drug are the former Republican Presidential Candidate Bob Dole and the Brazilian football legend Pele.

Pfizer’s billion dollar baby is starting to feel some setbacks. While the patent for Viagra has not yet expired in some countries, the proliferation of the generic versions is pinching the medical blockbuster drug baby already. The generic versions are created in Brazil, China and major industrial centers in the developing world.

Of course, chemists and small pharmaceutical companies know the many people in their countries-of-operation do not have enough money to buy such expensive medications. Aside from that, the cost of Viagra for example is equal or more than the daily wage of ordinary employees. Thanks to these small pharmaceutical companies, we can Buy Levitra Online for a fraction of the usual price.

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