Answer
It is for a chesty or productive cough where mucus needs to be cleared, rather than for suppressing a dry cough.
Sources for this answer
- Boots Mucus Cough Relief 100mg/5ml Oral Solution — Current selected SmPCemc · Summary of Product Characteristics
- Benylin Children's Chesty Coughs — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.