Tadalista 40 is a drug that is used to treat Erectile Dysfunction in men. The drug has an active ingredient called Tadalafil that works by soothing the muscles which in turn increases the flow of the blood that goes into the penis. It is important to remember that the drug Tadalafil 40 does not protect a person from any of the STDs, Tadalista 40mg is not an over-the-counter drug but is only available if a person has a prescription for the same. One can get their hands on this drug at any of the online pharmaceutical stores.