The main difference between vidalista 40 mg, this tablet is used to treat erectile dysfunction (ED), while this tablet is used to treat ED. Both Viagra and vidalista 40 mg are used by men over the age of 18. How Does Vidalista 40 mg Work? This tablet is a Tadalafil-based erectile dysfunction medication used to treat men with erectile dysfunction. It works by blocking the effects of impotence on the penis. Men who take this medication take it 30 minutes before sexual intercourse so that they can enjoy sexual intercourse with their partner. vidalista 40 mg should be taken with water and not broken or chewed.