Tadalafil is the generic name for Vidalista 40 mg tablet. It is a PDE 5 Inhibitor, which is a type of ED medication.  This class of medicines is most commonly used to treat erectile dysfunction. It is an oral prescription medication that is used to treat male sexual problems such as erectile dysfunction, impotence, and premature ejaculation. This medication enhances blood flow to the penis, resulting in an erection that lasts longer or till sexual fulfillment. Despite its effectiveness, you should take it at least 30 minutes before indulging in sexual activity.