Cialis is formulated with tadalafil as its primary active pharmaceutical component. Vardenafil is the active pharmaceutical component that is found in Levitra. Phosphodiesterase 5 (PDE5) inhibitors are the collective name for a category of drugs that includes both Cialis and Levitra. Cialis and Levitra have been given the green light by the Food and Drug Administration (FDA) as treatments for erectile dysfunction (ED) in males. ED is an illness in which a person is unable to achieve or maintain an erection.
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