Tazzle is a medication that contains the active ingredient tadalafil, which is used to treat erectile dysfunction (ED) and, in some cases, benign prostatic hyperplasia (BPH). Tadalafil, the active ingredient in Tazzle, is a phosphodiesterase type 5 (PDE5) inhibitor. It works by relaxing the blood vessels in the penis, allowing for increased blood flow during sexual arousal, which helps achieve and maintain an erection. It also helps with the symptoms of BPH by relaxing the muscles in the prostate and bladder.