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Cialis, on the other hand, was developed a few years later for the sole purpose of treating erectile dysfunction, and was approved in 2003. Unlike Viagra, it can be taken daily or "as-needed" within 36 hours of sex. Viagra works for roughly four hours and must be taken 30 to 60 minutes before sex, according to the drug’s website.

Common side effects of Cialis include headaches, flushing, or a stuffy or runny nose, reflecting the effects of the drug on the blood vessels of the head and neck. Cialis, like all other PDE5 inhibitors, affects blood vessels and smooth muscle in other parts of the body, not just the penis