Acetaminophen Dosing Guidelines for Infants

Introduction to Acetaminophen Dosing

• The American Academy of Pediatrics recommends weight-based dosing for acetaminophen in infants, rather than age-based dosing, to ensure accuracy and safety 2

Standard Dosing Recommendations

• For infants aged 1 day to 12 months, acetaminophen should be dosed at 10-15 mg/kg per dose, administered every 4-6 hours as needed, not exceeding 5 doses in 24 hours 2
• For a typical infant weighing 14 kg, the recommended dose is 140-210 mg per dose 2

Safety Considerations

• The maximum daily dose should not exceed 75 mg/kg/day or 4000 mg total, whichever is lower 2

Common Confusions and Errors

• The evidence suggests that confusion in acetaminophen dosing for infants arises from mixing up different medications and clinical contexts, such as conflating dosing for acetaminophen with dosing for other medications like pyrimethamine used in congenital toxoplasmosis treatment 1
• The 0.2 mg/kg dosing appears to reference pyrimethamine dosing for congenital toxoplasmosis, which is an entirely different medication and indication 1