Tadalafil is the generic name for the medication Vidalista 20mg. Impotence is an issue that affects males when they lose their ability to have sex. The effect of taking 20mg of Vidalista one hour prior to intercourse lasts for five to six hours. Women shouldn't use this medication because it is exclusively intended for use by men, and pregnant women in particular shouldn't use these tablets. Visit our website to learn more about the Vidalista 20.