Generic Tadalafil Vidalista 20 is used to treat male erectile dysfunction. The medicine is also suggested for calming the signs and symptoms of benign prostatic hyperplasia (BPH). It is a family of medicines called phosphodiesterase-5 (PDE5) inhibitors. The erection of the male organ is the result of an immense volume of blood trapped in the organ. The CGMP is responsible for the erection.