Benylin Mucus Cough Max Menthol is fast working and effective in thinning your excess chest mucus, making it easier to cough up. The added menthol ensures a pleasant flavour. It also contains guaifenesin, which thins and loosens a build-up of mucus effectively. Key features of Benylin Mucus Cough Max Menthol Guaifenesin thins and loosens mucus Contains menthol for an in ting taste. Gets rid of excess mucus Soothing effect Pr s deep penetrating relief. Please note that results may vary.