During sexual engagement, men with this illness are unable to get and maintain a strong erection. One possible explanation for this type of disordered sexual behavior is the lack of blood flow to the penile region during sexual stimulation. An element in Vidalista pills called tadalafil helps men get harder, longer erections during sex. Do not chew or crush the tablet; instead, take it with water. It takes four to six hours for this drug to start working.