Tadalafil is the active ingredient of the drug Vidalista Black, which is available in several dosage forms. The inability of a man to get and sustain an erection powerful enough for engaging in sexual activity is known as erectile dysfunction, and it is one of the most common sexual illnesses affecting males. Your medical history and a list of all the medications you take are accessible to your doctor. Use this drug only after seeing a doctor. Patients should take it 30 to 60 minutes before engaging in sexual activity, if at all possible. Take no more than one pill in 24 hours.