Tazzle 20 FM is a prescription medicine that contains Tadalafil 20 mg, a phosphodiesterase type‑5 (PDE5) inhibitor used mainly to treat erectile dysfunction (ED) and symptoms of benign prostatic hyperplasia (BPH) by relaxing blood vessels and improving blood flow to the penis and prostate area. Tadalafil’s primary action is vascular (blood flow) improvement, not direct hormone regulation. It does not significantly increase testosterone levels on its own, and its main clinical effects are unrelated to stimulating gonadal hormone production.