Robitussin Chesty Expectorant Cough Bottle is formulated with the active ingredient guaifenesin which belongs to a group of medicines called cough expectorants. It helps loosen phlegm (mucus) to make your cough more productive and relieve chest congestion.
Product Size: 100ml
Instructions:

Adults, the elderly and children over 12 years of age: Take 10ml up to four times per day.

Not suitable for Children under 12 years.