Levitra tablet contains the active ingredient vardenafil which works by relaxing the blood vessels in the penis when you are sexually aroused. This allows blood . Vardenafil, or Levitra is effective in treating male erectile dysfunction, but users should be aware of the possible adverse effects. Find out more. Take the 20mg. Do I get a bit of a headache and a little stuffed up taking Levitra? Sure I do, but I don't care. Having the ability to make love again to my wife has.