With Vidalista 20, male erectile dysfunction is cured. Tadalafil belongs to the group of drugs called phosphodiesterase 5 inhibitors. These drugs cause phosphodiesterase type-5 to stop working too soon. The penis is one area where this enzyme is active. Erectile dysfunction is the term used to describe a man's inability to sustain an erection after experiencing sexual arousal. Usually, this medicine treats erectile dysfunction within 30 to 60 minutes. It usually loses some of its potency after two hours, but it can last up to 36 hours. The drug should be stored at room temperature in a closed container away from heat sources, moisture, and direct sunlight.