Tazzle 20 mg is a medication commonly used to treat erectile dysfunction (ED) in men. Its active ingredient is Tadalafil, which belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. Tadalafil works by relaxing blood vessels and increasing blood flow to the penis during sexual stimulation, which helps achieve and maintain an erection. Sexual arousal is required for the medication to be effective; it does not cause spontaneous erections.