Tadalafil belongs to a class of drugs called PDE5 inhibitors. It works in treating erectile dysfunction by inhibiting the action of PDE5 to prevent breakdown of cGMP in the penis. Increased levels of cGMP lead to smooth muscle relaxation thus increasing blood flow to produce an erection. vidalista 10 helps men get and maintain erections during sexual stimulation. However, it does not cure erectile dysfunction nor it increases a man’s libido. This drug does not prevent pregnancy and the spread of sexually transmitted diseases.