When you suck on a lozenge, it starts to dissolve and release medicine. It is intended to dissolve slowly in the mouth to temporarily suppress the cough, and lubricate and soothe irritated tissues of the throat. Some have medications that help fight colds, and most have anesthetic to help ease the pain. Lozenges also contain menthol or eucalyptus, which can help cool and sooth the throat. Others contain honey, which is known to have cough suppression properties.