Vidalista 20 is the brand name for tadalafil. This is an effective and commonly used impotence pill that Centurion Laboratories Pvt. Ltd originally manufactured. It contains a dual action mechanism – it works on the blood flow to the penis and increases the supply of nitric oxide, which causes smooth muscles of the penis’ main chamber to relax and increase blood flow, which results in strong erections. This pill is manufactured in varying strengths; 10mg, 40mg, and 80mg pills are all available.