Answer
It must not be used for pain after tonsillectomy or adenoidectomy for obstructive sleep apnoea in anyone younger than 18 because life-threatening morphine toxicity has occurred.
Sources for this answer
- Codeine phosphate 30mg Tablets — 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.