This question has also been asked and answered here: Cialis vs Viagra - What's the difference between them?
Currently, a generic form of Viagra (sildenafil citrate) is not available. The medication is manufactured by Pfizer and is currently protected by a patent that prevents any generic versions from being manufactured. It is expected that once this patent expires, several companies will start manufacturing a generic version of Viagra.
Sildenafil is the active ingredient of Viagra.
- Sildenafil Information for Consumers
- Sildenafil Information for Healthcare Professionals (includes dosage details)
- Side Effects of Sildenafil (detailed)
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