Lumartuss (Guaifenesin) 100mg/5ml Syrup is an expectorant used to relieve chest congestion and help clear mucus from the airways. Each 60ml bottle contains a syrup with 100mg of Guaifenesin per 5ml. Guaifenesin works by thinning and loosening mucus in the chest, making it easier to cough up and clear from the respiratory tract. This syrup is commonly used to treat symptoms associated with colds, bronchitis, and other respiratory conditions involving congestion.