Clinicians Prospan(R), Bronchial Syrup is a powerful herbal formula made from dried ivy leaf to soothe the throat and help clear the airways. It also helps thin mucous and moistens dry irritated membranes of the airways and is a well tolerated formula suitable for children under 6. Clinicians Prospan(R), Bronchial Syrup main active ingredient is Ivy Leaf. For literally hundreds of years, people have placed their trust in the herbal power of wild ivy for respiratory tract support.