Acetaminophen Dosing for a 35-Pound Child
The recommended dose of acetaminophen (Tylenol) for a 35-pound (16 kg) child is 160-240 mg every 4-6 hours, not to exceed 5 doses (800-1200 mg) in 24 hours.
Dosage Calculation
The proper way to calculate acetaminophen dosing for children is based on weight:
- The recommended dosage range is 10-15 mg/kg per dose 1
- For a 35-pound child (approximately 16 kg):
- Minimum dose: 16 kg × 10 mg/kg = 160 mg
- Maximum dose: 16 kg × 15 mg/kg = 240 mg
Administration Guidelines
- Administer every 4-6 hours as needed
- Do not exceed 5 doses in 24 hours
- Maximum daily dose should not exceed 75 mg/kg/day or 1200 mg for this child
Formulation Options
Acetaminophen is available in several pediatric formulations:
- Children's liquid suspension (160 mg/5 mL): 5-7.5 mL per dose
- Children's chewable tablets (80 mg or 160 mg): 2-3 tablets (80 mg) or 1-1.5 tablets (160 mg)
- Children's meltaway tablets (80 mg or 160 mg): 2-3 tablets (80 mg) or 1-1.5 tablets (160 mg)
Important Considerations
- Always use the measuring device provided with the medication for liquid formulations
- Do not use household teaspoons or tablespoons as they can lead to dosing errors 2
- Weight-based dosing is more accurate than age-based dosing 2
- Underdosing is common and may lead to inadequate fever or pain control 3
- Overdosing can lead to hepatotoxicity
Common Pitfalls to Avoid
- Using adult formulations for children without proper dose adjustment
- Confusing different formulation strengths (infant vs. children's)
- Using multiple acetaminophen-containing products simultaneously (can lead to overdose)
- Extending treatment beyond 5 days without medical consultation
- Administering doses more frequently than every 4 hours
When to Seek Medical Attention
Contact a healthcare provider if:
- Fever persists for more than 3 days
- Pain persists for more than 5 days
- Symptoms worsen
- New symptoms develop
Proper weight-based dosing of acetaminophen is essential for both safety and efficacy in children. Research shows that 10 mg/kg may be insufficient for antipyresis, while 15 mg/kg is generally effective 3, making the 160-240 mg range appropriate for this 35-pound child.