Before a medicine is Launched in the market for use it undergoes pre–clinical tests in the lab. These primary tests indicated that Viagra is nontoxic and could safely be used in clinical trials.
Trials:
Trials are planned in such a way to make sure that the outcomes they produce are dependable. In double-blind trials neither the doctors nor their patients are aware that they are using the medicine as a trial. This is to prevent any bias in the clinical trials and it also makes sure that any effects are due to the active ingredient and not because the patient feeling better as they are under a new type of treatment.

Angina treatment:

Lots of effort is invested in creating new medicines, many fails in clinical trials phase and never go for production. In 1991 clinical trials of Viagra checked whether it can treated angina treatment. The trial showed that Viagra is not a potent treatment. Were as it reported some adverse effects.In some studies it was reported that Viagra increases the erections and as a result of which in 1992 researchers focused on developing Viagra for the treatment for erectile dysfunction. Erectile dysfunction.Trials begin in 1993 to check if Viagra could be used to cure erectile dysfunction. It was given to 3,000 patient’s b/w age 19 to 87 years old. it proved to give statistically good value to trat erectile dysfunction.

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