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About Viagra
Compare to Cialis
| Viagra | Cialis | |
| Nickname | the little blue pill | the weekender |
| Lasts for | 4-8 hours | 36 hours |
| Begins working in | 15 minutes | 30 minutes |
| Time on the market | 7.6 years | 2.3 years |
| Price per pill | $10 | $10 |
| Google hits | 16.2 million | 1.32 million |
| 2004 sales | 1.7 billion | 272 million |
| 2005 sales | 1.6 billion | 746.6 million |
| 2006 sales | 1.66 billion | 971 million |
| 2007 sales (estimated) | $2 billion | $1 billion |