Tazzle is a prescription medication containing Tadalafil, which belongs to the class of drugs known as PDE5 inhibitors. It is primarily used to treat conditions related to blood flow and smooth muscle relaxation. Tazzle is a prescription medication containing Tadalafil, which belongs to the class of drugs known as PDE5 inhibitors. It is primarily used to treat conditions related to blood flow and smooth muscle relaxation. Tazzle is a prescription medication containing Tadalafil, which belongs to the class of drugs known as PDE5 inhibitors. It is primarily used to treat conditions related to blood flow and smooth muscle relaxation. Tazzle is a prescription medication containing Tadalafil, which belongs to the class of drugs known as PDE5 inhibitors. It is primarily used to treat conditions related to blood flow and smooth muscle relaxation.