Vidalista 40 condition that makes you unable to get or keep an erection firm enough for s*xual intercourse. benign prostatic hyperplasia: a condition that results in an enlarged prostate causing difficulty urinating. The recommended dose of Vidalista 20 mg is one tablet per day. Vidalista black 80 should not be consumed more than once in 24 hours. It can be taken with or without food. It should be taken approximately 30 minutes to 1 hour before s*xual activity or as directed by a doctor.