Instarise 100 mg is one of the medicines used for the treatment of erectile dysfunction that contains Sildenafil which belongs to a group of medicines called phosphodiesterase type 5 inhibitors that helps a man in attaining and maintaining an erect penis which is sufficient for satisfying sexual intercourse. The medicine is completely prohibited to be taken by women, children, and adolescents under 18 years of age, it is only for men.