Total daily dose of paracetamol must not exceed 4000mg or 4g (including this product). Leave at least 4 hours between doses of paracetamol-containing products.

Over 16 years: 20ml just before bedtime.

Under 16 years: Not to be given except on medical advice.

Not to be used for more than 3 days without medical advice.

Green syrup containing in 20ml: Paracetamol 1000mg, Promethazine, Hydrochloride 20mg and Dextromethorphan Hydrobromide 15mg

https://www.medicines.org.uk/emc/files/pil.354.pdf