One of a limited number of clinically validated PDE5 inhibitor medications, Vidalista Black 80 mg is designed to treat the majority of men with erectile dysfunction (ED), a condition in which a man is unable to develop or sustain a firm penis appropriate for engaging in sexual activity. You can take this medication with or without food. Adhere to your doctor's instructions when using this medication. The half-life of this drug is 36 hours. Do not chew or crush the tablet; instead, take it with water. It is not advisable to take more than one dose in 24 hours. It should be taken as prescribed by your physician or between thirty and one hour before the scheduled sexual activity.