With companies marketing drugs directly to consumers promising cures for almost anything, an increasingly destigmatized cannabis seems a likely target for the industry’s next game-changing medicine.

In the 1980s, scientists working for Pfizer set their sights on developing a drug for the pharmaceutical giant that would relieve hypertension and help save the lives of those suffering from angina.

After years of tireless research by some of the best scientific minds money could buy, Pfizer created the chemical compound sildenafi l citrate in 1989.

The company poured more money, time and talent into putting its new drug through clinical trials, only to discover sildenafi l citrate wasn’t very effective in treating heart problems.

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Alicia Kort ~ Newsweek.com ~