Tazzle 20 FM contains tadalafil 20 mg, a phosphodiesterase type 5 (PDE5) inhibitor used to treat erectile dysfunction (ED). It works by increasing blood flow to the penis during sexual stimulation, helping men achieve and maintain an erection. Sexual stimulation is still necessary for the medicine to work. Improved erectile function may contribute to greater sexual confidence, satisfaction, and relationship quality. Clinical research involving tadalafil 10 mg and 20 mg found improvements in overall sexual satisfaction, satisfaction with intercourse, and enjoyment compared with placebo in men with ED.