The active substance of Vidalista 80, a drug intended for the treatment of male impotence or erectile dysfunction, is tadalafil. It belongs to the class of medications known as phosphodiesterase type 5 (PDE5) inhibitors, which work by enhancing blood circulation to the penis in response to sexual arousal. If you opt for the 80mg Tadalafil tablets, take them orally while drinking from a glass of water. To achieve the desired effects, you should take the Vidalista 80 mg tablet at least 30 to 60 minutes prior to sexual intercourse. You have to comply with the dosage recommendations given by your doctor.