Viagra (sildenafil) was originally developed by Pfizer scientists as a treatment for which medical condition before its famous side effect was discovered?

In the pharmaceutical industry, some of the most profitable products emerge not from their intended research goals but as fortunate side effects. Understanding these happy accidents reveals much about how scientific discovery and product development intersect in unexpected ways, sometimes creating entirely new market categories worth billions of dollars. Test your knowledge about one of the most famous examples of serendipity in pharmaceutical product history!

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Hypertension and angina (cardiovascular disease)
Depression and anxiety disorders
Hair loss and male pattern baldness
Gastric ulcers and acid reflux