Vigora is a common medicine used to treat impotence in men. Sildenafil in this drug is an active ingredient made up of 20 mg which is a PDE-5 inhibitor. By using this medicine one hour before sexual intercourse, you can achieve a strong and stiff erection. This drug is used only for the prevention of sexually transmitted diseases. This medicine should be used only once in 24 hours. Visit our site erectilepharma.com for more information.