Vardenafil (Levitra) are intended to effectively treat erectile dysfunction. Levitra 20 mg works by increasing the flow of blood into the penis during sexual activity, causing an erection. Levitra erection pills are not an aphrodisiac and stimulation will be needed to develop an erection. The recommended dose of Levitra 20 mg (vardenafil) in 24 hours is 20 mg (1 tablet). However, the initial dose of generic Vardenafil should be 10 mg and 5 mg in men of 65 years and older. It is to take 60 minutes before sexual activity. Generic Vardenafil tablets can be taken with or without food. And always take this medicine with a large glass of water.