The active ingredient in Vidalista is Tadalafil, which works in a similar way to Sildenafil, the main ingredient in Viagra. The difference is that Tadalafil lasts much longer and does not need to be taken every day. Its long action time has led to it being nicknamed “The Weekender”. Vidalista 20 is available as a regular tablet, chewable tablets and sublingual tablets. The chewable version is marketed as Vidalista CT and the sublingual tablet is branded as Vidalista Professional.