Tadarise 20 mg is a prescription medication used to treat erectile dysfunction (ED) and benign prostatic hyperplasia (BPH) in men. Its active ingredient is tadalafil. Tadalafil 20 mg. Tadalafil is a phosphodiesterase type 5 (PDE5) inhibitor that works by increasing blood flow to the penis during sexual arousal, which helps in achieving and maintaining an erection.