Vidalista 20 mg is an effective tablet prescribed by a doctor for patients with sexual problems such as erection, erectile dysfunction, impotence, etc. The main active ingredient in shingles is tadalafil. This drug should be taken by men 30 minutes before sexual intercourse which helps men to get a hard longer erection in their sex life. Which comes in various dosages so it is necessary to consult your doctor while serving this medicine.