Levomenthol, Squill Tincture, Liquorice Liquid ExtractChesty cough mixture mentholated relieves the symptoms of chesty coughs and sore throats.Covonia Chesty Cough Mixture Mentholated contains liquorice and squill which belong to a group of medicines known as expectorants. They help remove phlegm in people with chesty coughs. Menthol helps relieve congestion in chesty coughs and bronchitis.Effective relief of troublesome chesty coughs, Non drowsy, Expectorant Effective relief of troublesome chesty coughs. Non drowsy. Expectorant.