These pills were accidentally discovered in 1990 and began to enter the market in 1998, as male enhancement pills.
The source of the drug is after the chemist "Simon Campbell" who was researching a drug for heart disease with the company "Pfizer".
The chemist and the "Pfizer" company discovered a drug called "amlodipine" which was the fourth most popular drug for heart disease.
Meanwhile, Simon made another discovery that a molecule called "cyclic GMP" helps relax muscles.
In 1990, In the last 10-day test on the blood pressure drug, in volunteer patients, who showed up for the test of the amazing drug.
In the study the results were that the volunteers were experiencing erections that were more than normal.
These results were very surprising and unexpected for the team involved in this experiment.
It didn't end when they continued the research that led to the unexpected discovery of Viagra in 1992, but after that discovery, Pfizer conducted 21 more experiments.
These tests involved patients with erectile dysfunction and in every test the drug worked, which was surprising, because usually no tests give 100% results.
Clinical trials of Viagra were so successful that Pfizer decided to bring it to market as soon as possible.
Within six years, the Medicines Authority, FDA approved the pill for sale. In 1998, Viagra entered the market and got the name 'Blue Pill'.
How Viagra works in the body "Mechanism of action" It improves blood flow in the penis.
Normally, the human brain releases a neurotransmitter called nitric oxide which travels to the penis to produce circulating GMP.
People with erectile dysfunction do not make enough circulating GMP, and Viagra improves this process.
70% of the results of the 50mg tablets are obtained, but the results are 60% for diabetics and high blood pressure patients.
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