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Sources
- Pfizer's Viagra.com
- Viagra.com: How does Viagra work?
- Human Biology Web Site: What is Viagra and How Does It Work?
- CNN.com: U.S. discoverers of Viagra principle get Nobel Prize - Oct. 12, 1998
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- SchoolScience: The Viagra story
- Boston University: The Current and Emerging Medical Therapies for Male Erectile Dysfunction
- HolisticHealthTools: Viagra & The Red Meat Connection
- USRF: Viagra vs. the new PDE-5 Inhibitors: Levitra and Cialis
- MedReviews: Lower Urinary Tract Symptoms, Benign Prostatic Hyperplasia, Erectile Dysfunction, and Phosphodiesterase-5 Inhibitors
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