The man who invented Viagra: 'I'm 74, and convinced it helps my memory'

Dr Brown reveals how he persuaded Pfizer to fund his research into sildenafil, a drug that became Viagra, and how it can benefit more than just erectile dysfunction. He also shares his personal experience of taking Viagra and its potential for improving memory.

Pfizer: Story of a company that discovered Viagra (Sildenafil) - Dr. Seb UK

It stands behind some of the best-sold medicines in history including Lipitor, Diflucan, Azithromycin and Viagra. Currently headed by Ian Read, a seasoned Scottish businessman and an expert in the pharmaceutical industry, Pfizer achieved revenue of 52.55 billion dollars in 2017 alone and is sure to expand its business as it has been doing ever since the earliest 20 th century.