Cialis, Levitra, and Viagra are oral medications used to treat erectile dysfunction (ED). You may also know them by their generic names, tadalafil (Cialis), vardenafil (Levitra), and sildenafil (Viagra). About 30 million men occasionally have a problem with getting or keeping an erection, according to the Urology Care Foundation. When ED becomes a problem, many men turn to oral ED medications. Cialis, Levitra, and Viagra each work in similar ways. But there are also some differences, such as when you take them, how long they work, and what their side effects are. Cialis, Levitra, and Viagra are all in a class of drugs called PDE-5 inhibitors. These drugs work by blocking an enzyme called phosphodiesterase type 5. "Some men experience side effects while taking Levitra. It is important that you see a doctor immediately if you experience a painful or prolonged erection as a side effect of your treatment." Dr Louisa Draper Levitra contains a substance called vardenafil. 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What Levitra is and what it is used for Levitra contains vardenafil, a member of a class of medicines called phosphodiesterase type 5 inhibitors. The text only version may be available from RNIB in large print, Braille or audio CD. They are used for the treatment of erectile dysfunction in adult men, a condition which implies difficulties in getting or keeping an erection. For further information call RNIB Medicine Leaflet Line on 08. At least one in ten men has trouble getting or keeping an erection at some time. Levitra tablets belong to the pharmacological group of drugs for the treatment of erectile dysfunction. They are used to treat men’s impotence of the penis. Levitra tablets have a round shape, biconvex smooth surface, and light yellow color. The main active substance of the drug is vardenafil. Levitra is produced as tablets covered with a film coating. The color of tablets for men is light orange, and it may vary to gray orange. 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