ROBITUSSIN CHESTY CUOGH 100MLSExpectorant for treatment of coughs.loosens and thins mucus or phlem making it easier to cough up.. Has a soothing effect. Oral liquid containing in 5ml: Guaifenesin 100 mg Dosage: Adults: 10ml 4 times daily. Children: 6-12 years: 5ml 4 times daily. 1-6 years: 2.5ml 4 t..