This is not a complete list of side effects and others may occur. Pili and fimbriae however, in solution form micelles. Vardenafil is taken only when needed, about 60 minutes before sexual activity. S permit ing rapid decomposition. Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor will probably start you on an average dose of vardenafil tablets and increase or decrease your dose depending on your response to the medication.Vardenafil is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Vardenafil is in a class of medications called phosphodiesterase (PDE) .  · Description and Brand Names. Drug information provided by: Merative, Micromedex® US Brand Name. Levitra; Staxyn; Descriptions. Vardenafil is used to treat . Vardenafil (Levitra): Uses, Alternatives, Side Effects & More – GoodRx feeling faint or weak, dizziness, blurry vision, feeling confused Erection lasting for more .