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What about Cialis and Levitra?
Viagra is a hugely successful drug, and other drug companies wanted a piece of the action. They developed different chemicals to block the PDE5 enzyme and created two new drugs: Cialis (tadalafil) and Levitra (vardenafil).

Because Cialis and Levitra block the PDE5 enzyme, they work exactly the same way as Viagra. They help men who have trouble maintaining an erection because of blood flow problems, and they only work when the man is sexually aroused.

Because they block PDE5 with different chemicals, however, there are some important differences between the three drugs. For example:

Only Viagra causes color-vision problems.
Cialis causes muscle aches in about 5 percent of patients.
Viagra and Levitra last about four hours in the bloodstream. Cialis stays in the bloodstream much longer (it has a 17.5-hour half life) and can therefore be effective for more than a day.

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