Vidalista Black 80 mg helps treat erectile dysfunction. Both are PDE5 inhibitors, which help to expand your blood arteries. Furthermore, they both temporarily increase penile blood flow. Take your tablets whole, preferably with some juice or water (not grapefruit juice). Keep out of heat and moisture at room temperature. Tadalafil is typically used only once per day. Follow the directions on the label of your medication. To treat erectile dysfunction, take Cialis just before sexual activity, but no more than once per day. It can be used for up to 36 hours before sexual activity. Cialis can help you have an erection when you are sexually excited.