Vidalista 20 tablet is for the treatment of erectile dysfunction in men. Unlike other oral medications prescribed for ED, the effects of tadalafil can last up to 36 hours, and this is one reason why it is also called the weekend pill. The most active ingredient in this drug is tadalafil. It is important to consult a doctor once before taking this medicine. The effect of this drug is shown in about 30 minutes depending on the person.