Infant Tylenol Dosage
Determine weight-based acetaminophen dosing (160 mg/5 mL formulation) for infants and toddlers. Avoid exceeding the daily maximum.
Typical: 10–15 mg/kg every 4–6 hours as needed.
Most U.S. infant/children acetaminophen is 160 mg per 5 mL.
Dosage Results
Per dose
135 mg
≈ 4.2 mL (32.0 mg/mL suspension).
Daily maximum
675 mg/day
Do not exceed 5 doses in 24 hours (every 4–6 hours).
How to Use This Calculator
Verify infant age and weight
Consult a pediatrician before giving acetaminophen to infants younger than 12 weeks.
Enter the weight and concentration
Accurate measurements ensure the correct mg/kg dose and liquid volume.
Administer and track doses
Allow at least 4 hours between doses. Keep a dosing log to prevent accidental overdose.
Formula
Per dose (mg) = Weight (kg) × mg/kg (10–15 mg).
Based on American Academy of Pediatrics and manufacturer guidance for acetaminophen dosing.
About Infant Acetaminophen
Acetaminophen (paracetamol) is commonly used for infant fever and pain. It is metabolized by the liver, so avoid overlapping acetaminophen-containing products (e.g., some cold remedies). Counsel caregivers to use oral dosing syringes provided with the medication, not kitchen spoons.
Seek medical care for signs of overdose: persistent vomiting, irritability, jaundice, or lethargy. Do not use acetaminophen to reduce low-grade fevers in otherwise well infants; fever may help fight infection.
Frequently Asked Questions
How soon does acetaminophen work?
Typically within 30 minutes, with peak effect around 1 hour.
What if I miss a dose?
Give the dose when remembered if at least 4 hours since the last dose. Do not double-up.
Can I alternate acetaminophen with ibuprofen?
Yes for children over 6 months, but keep careful track of timing to prevent confusion and overdose.
Is rectal acetaminophen dosed the same?
Yes, mg/kg is the same. Suppositories are useful when oral dosing isn't tolerated.
When should I call the doctor?
Call for persistent fever (>3 days), temperature >40°C (104°F), or if the infant is younger than 12 weeks with fever.