Viagra: things you should know

1. The history of Viagra In the early 1980s, medical science realized it was possible to artificially induce an erection by means of an injection. The breakthrough came with the development of a muscle relaxant called Phentolamine. The problem, however, was that the erection resulted from the injection no matter what the man was doing.

Viagra and Sildenafil citrate

When a drug goes through the research and development process, the manufacturer is investing a considerable amount of capital in proving the drug to be both effective and safe. To give companies an incentive to go through this long and financially risky process (not every drug under development is effective enough to sell to the

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At present, for the prevention and treatment of erectile dysfunction are most often used such drugs as Viagra (active ingredient – sildenafil citrate) and Cialis (active ingredient – Tadalafil). First in the world pharmaceutical market appeared Viagra 1998, Cialis on sale in 2003. The mechanism of action of both drugs is the same and by