Sugar-free Covonia Chesty Cough Syrup relieves chesty coughs and loosens sticky mucus. Covonia Sugar-Free Chesty Cough Syrup is designed to remove sticky mucus and clear chesty coughs. Covonia helps by releasing the irritating phlegm that might accumulate in the back of your throat and chest. Covonia relieves your chesty cough by clearing your airways and allowing you to breathe easily again. Vegetarians, vegans, and coeliacs may all enjoy Covonia. It’s sugar-free and alcohol-free.