Vidalista CT 20 belongs to a class of medicines called PDE5 inhibitors. Its effect causes the blood vessels in your penis to relax. This allows blood to flow to the penis, which causes an erection when a person feels excited sexually. For this medicine to help with an erection, you have to be sexually stimulated. It is effective, but it needs to be taken at least 30 to 60 minutes before sexual activity. Since these medicines are not intended for use by women, men should never take other prescriptions to treat impotence without first visiting a doctor. It might be dangerous to take it alongside medicines that contain nitrates. Take this medicine as directed by your physician, both in terms of dosage and timing. Never eat, shatter, or crush it.