# AI recommends codeine for postoperative pain in a child after tonsillectomy, ignoring FDA black box warning

- **ID:** `medical/pediatric-codeine-post-tonsillectomy`
- **Domain:** medical
- **Category:** data_error
- **Error Code:** `FDA-2013-COD`
- **Verification:** ai_generated
- **Fix Rate:** 85%

## Root Cause

Codeine is a prodrug metabolized by CYP2D6 into morphine; ultra-rapid metabolizers (3-10% of population) can convert dangerously high levels, causing fatal respiratory depression. FDA black box warning (2013) contraindicates codeine in children <12 for post-tonsillectomy pain, and EMA restricts use in children <18 after tonsillectomy/adenoidectomy for obstructive sleep apnea.

## Workarounds

1. **Recommend acetaminophen (15 mg/kg every 4-6h, max 75 mg/kg/day) and ibuprofen (10 mg/kg every 6-8h, max 40 mg/kg/day) alternating for postoperative pain. If opioid needed, use morphine (0.1-0.2 mg/kg IV/PO every 4h) with continuous monitoring of respiratory rate and oxygen saturation.** (90% success)
   ```
   Recommend acetaminophen (15 mg/kg every 4-6h, max 75 mg/kg/day) and ibuprofen (10 mg/kg every 6-8h, max 40 mg/kg/day) alternating for postoperative pain. If opioid needed, use morphine (0.1-0.2 mg/kg IV/PO every 4h) with continuous monitoring of respiratory rate and oxygen saturation.
   ```
2. **If opioid is absolutely necessary (e.g., severe pain refractory to NSAIDs), use morphine sulfate 0.1-0.2 mg/kg IV/PO every 4h with respiratory monitoring. Do not use codeine, tramadol, or hydrocodone.** (85% success)
   ```
   If opioid is absolutely necessary (e.g., severe pain refractory to NSAIDs), use morphine sulfate 0.1-0.2 mg/kg IV/PO every 4h with respiratory monitoring. Do not use codeine, tramadol, or hydrocodone.
   ```

## Dead Ends

- **Suggesting that any opioid is safe for pediatric post-tonsillectomy pain** — All opioids carry risk, but codeine is uniquely dangerous due to unpredictable metabolism. Safer alternatives like ibuprofen or acetaminophen with limited oxycodone are preferred. (70% fail)
- **Recommending codeine with a warning to 'check CYP2D6 status first'** — CYP2D6 genotyping is not routinely available preoperatively; the warning is impractical and still exposes the child to risk if test is not done. (85% fail)
- **Using codeine for children >12 years old without considering sleep apnea history** — Even in children >12, codeine is contraindicated if obstructive sleep apnea is present (common post-tonsillectomy). The warning is not age-only. (60% fail)