I have few side effects, sometimes small headaches and discomfort in the stomach. I use it for a month and it works well. Levitra contributes to a stable erection with minimal stimulation. I take 5 mg Vardenafil pills and lasts 10 hours. I think, with my dosage, I have the initial stage of dysfunction. Works good. Before that, I once took a full dose of Viagra which caused severe headaches.