Follow the doctor's instructions on the dosage and duration of use of Vidalista Black. Before taking the medicine, make sure you read the label once. This medicine is taken orally in tablets that must be swallowed whole. Do not chew or crush the medication, take it with a glass of water prior to intimacy. The medicine will give you a hard erection for about 36 hours, and it is recommended to take it 30 to 60 minutes before having sex. Avoid chewing or breaking the pills. It may work better if taken on an empty stomach, although it can be taken with or without food.