Tadalafil 20 is used to treat erectile dysfunction in males (also called sexual impotence). The class of drugs known as phosphodiesterase 5 (PDE5) inhibitors includes tadalafil 20. These medications stop phosphodiesterase type-5 from functioning too quickly. One of the places where this enzyme functions is the penis.
When a guy experiences sexual excitement or struggles to maintain an erection, he may have erectile dysfunction, in which case the penis does not stiffen and expand.
A man's body often responds to sexual stimulation by increasing blood flow to his penis, which results in an erection. Tadalafil increases blood flow to the penis by regulating the enzyme, which aids in maintaining an erection after the penis has been stroked. Without touching the penis physically,