Vidalista 20 mg is a drug that relaxes the muscles in blood vessels, improving blood flow to specific areas of the body. This is accomplished by specifically boosting blood flow to the penis, which grows the penis and results in an erection. Take it 30 to 60 minutes before having any sexual relations. It will not be randomly because an erection when taken without arousal rather, it will only work when a person is sexually stimulated. This medication should not be taken by anyone who has liver problems since it may worsen their condition. Consult your doctor if you have any inquiries.