The vidalista black 80 tablet is intended to treat erectile dysfunction and impotence in males. When having sex, this medication helps males achieve a hard erection. Tadalafil is a component in this medication. This medication can be used either before or after a meal. If this medication is given half an hour before sexual activity, it works nicely. As prescribed by your physician, you should take this medication. This medication takes 36 hours to take effect.