Tazzle 20 mg Tablet is a branded medication whose generic (active) ingredient is tadalafil.   What “generic name” means The generic name of a medication refers to the active chemical substance in the drug — the ingredient that produces the therapeutic effect. In this case: Tadalafil is the generic name of Tazzle 20 mg. It belongs to a class of drugs called PDE5 inhibitors (phosphodiesterase type 5 inhibitors).   Tazzle 20 mg tadalafil does Tadalafil works by relaxing blood vessels and increasing blood flow, especially in the penis, which helps men achieve and maintain an erection during sexual stimulation. It’s used to treat erectile dysfunction (ED) and may also be used for benign prostatic hyperplasia (BPH) — enlargement of the prostate gland.  Note Always take tadalafil (or any erectile dysfunction medication) as prescribed by your doctor and follow the official patient information leaflet included in the box.