Usage: an oral drug that is used for treating impotence (the inability to attain or maintain a penile erection) and benign prostatic hyperplasia (BPH) Tadalafil (Tadalifil citrate), a phosphodiesterase type 5 inhibitor, is used to treat erectile dysfunction (ED) and decreased libido in males. Tadalafil works by aiding relaxation of blood vessels and increasing blood flow in the penis during …