Vidalista 40 is a tadalafil-based medicine used to treat erectile dysfunction (ED) in men. It is intended to help men achieve and maintain an erection when sexually aroused. Vidalista 40 mg is a high-strength tadalafil product. The usual FDA-labeled as-needed tadalafil dose for ED starts at 10 mg and may be adjusted to 5 mg or 20 mg. A 40 mg dose is above that standard ED maximum. Do not take Vidalista 40 mg without medical advice.