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The intention was:

Pharmaceutical company Pfizer wanted to develop a medicine for angina, chest pains and high blood pressure – a great intention.

The course of action was:

Pfizer invested in and carried out clinical trials for 6 years under the leadership of Ian Osterloh. As far as is known the research was carried out properly and there were no mishaps. Except...

The result was:

After 6 years it became clear that the medicine did not have the desired effects. However, many patients reported erections and improved potency as side effects.

The lesson was:

Pfizer radically changed strategy and tested the new medicine against erection disorders.

Further:

Today, every second, someone somewhere is taking a Viagra pill.