A medication called vidalista 20mg is used to treat erectile dysfunction. A prescription medication called vidalista is used to treat erectile dysfunction. Vidalista works by boosting blood flow in blood vessels to sustain an erection. Take this medication 30 minutes to an hour before engaging in sexual activity. This medication can be used either before or after meals. Alcohol and fattening meals should not be consumed together with this medication since they will lessen its effectiveness.