Levitra (vardenafil) is a prescription drug commonly used for the treatment of erectile dysfunction cases in spite of the age and health condition of the patient. It belongs to the group of drugs called phosphodiesterase inhibitors that work by increasing the blood flow to the penis. This medicine will not increase your sexual desire as its effects are purely physical. However, it's important to obtain a prescription first to make sure your condition requires treatment with Levitra. Take Levitra on the when-needed basis. However, make sure you do not take this medicine more often than once every 24 hours.