150
mg
4.7
mL
0
tablets
0
tablets
750
mg
5
doses
4
hours
150
mg
4.7
mL
0
tablets
0
tablets
750
mg
5
doses
4
hours
The Infant Tylenol Dosage Calculator provides accurate acetaminophen (paracetamol) dosing for infants and children based on weight, supporting safe and effective use of this widely used antipyretic and analgesic. Acetaminophen (brand name Tylenol in the US) is the most commonly administered over-the-counter medication in pediatrics, used for fever reduction and mild-to-moderate pain relief in children as young as 3 months of age.
The recommended pediatric dose of acetaminophen is 10-15 mg/kg per dose, administered every 4-6 hours as needed, with a maximum of 5 doses in 24 hours. This calculator uses 15 mg/kg as the standard dose, which is the upper end of the recommended range and provides optimal antipyretic and analgesic effect. The maximum single dose is 1,000 mg (adult maximum), and the maximum daily dose is 75 mg/kg/day or 4,000 mg/day, whichever is less.
Accurate weight-based dosing is critical for acetaminophen safety. Underdosing (common with conservative estimates) provides inadequate fever control and pain relief. Overdosing poses a serious risk of hepatotoxicity, the leading cause of acute liver failure in children in developed countries. Acetaminophen toxicity can occur with single doses exceeding 150 mg/kg or repeated doses exceeding 75 mg/kg/day over multiple days.
Multiple formulations of acetaminophen are available for different age groups. Infant drops and children's liquid both contain 160 mg per 5 mL (standardized since 2011 to reduce confusion). Children's chewable tablets contain 160 mg per tablet. Junior strength tablets contain 325 mg per tablet. This calculator converts the mg dose to the appropriate volume or tablet count based on the selected formulation.
Important safety notes: acetaminophen should not be given to infants under 3 months without physician guidance due to concerns about masking serious neonatal infections. For infants 3-6 months, dosing should be confirmed with a healthcare provider. Combination products (cold/flu medications) containing acetaminophen must be accounted for to avoid inadvertent double-dosing. Parents should always use the measuring device provided with the specific product.
The 2011 standardization of infant and children's liquid concentrations to a single concentration (160 mg/5 mL) was a significant safety improvement, as the previous infant drops concentration (80 mg/0.8 mL) was 3.3 times more concentrated than children's liquid, leading to numerous overdose errors when caregivers confused the products.
This calculator provides weight-based dosing for all common formulations, including the daily maximum dose to help caregivers track total intake. It is designed to support informed dosing decisions but should be used in conjunction with product labeling and healthcare provider guidance, especially for young infants and children with liver conditions.
The dose is calculated at 15 mg/kg of body weight, capped at a maximum of 1,000 mg per dose. For liquid formulations (160 mg/5 mL), the volume is calculated by dividing the dose by the concentration per mL (32 mg/mL). For tablets, the number of tablets is the dose divided by tablet strength. Maximum daily dose is 75 mg/kg/day or 4,000 mg/day, whichever is less.
Give the calculated dose every 4-6 hours as needed, up to 5 doses per day. Do not exceed the Max Daily Dose. Use the measuring device included with the product. Volume dose applies to liquid formulations; tablet dose applies to chewable or junior strength tablets. Round to the nearest practical measurement.
Inputs
Results
150 mg dose (4.7 mL of infant drops) every 4-6 hours, max 750 mg/day.
Inputs
Results
375 mg dose (approximately 2.5 chewable tablets) every 4-6 hours.
The recommended dose is 10-15 mg/kg per dose, given every 4-6 hours as needed, with a maximum of 5 doses in 24 hours. This calculator uses 15 mg/kg for optimal effect. The total daily dose should not exceed 75 mg/kg/day or 4,000 mg/day.
Acetaminophen is generally considered safe from 3 months of age. For infants under 3 months, consult a physician before giving any medication, as fever in very young infants requires medical evaluation to rule out serious bacterial infections.
Some pediatricians recommend alternating acetaminophen and ibuprofen every 3-4 hours for persistent fever. However, this practice increases the risk of dosing errors. If alternating, keep a written log of what was given and when. Ibuprofen should not be given to infants under 6 months.
Early symptoms (0-24 hours) include nausea, vomiting, and malaise. Liver damage develops over 24-72 hours with right upper quadrant pain, jaundice, and elevated liver enzymes. If overdose is suspected, seek emergency care immediately. N-acetylcysteine is the antidote.
In 2011, manufacturers standardized all pediatric liquid acetaminophen to 160 mg/5 mL. Previously, infant drops were 80 mg/0.8 mL (much more concentrated), causing frequent overdoses when caregivers accidentally used the children's liquid dosing instructions for infant drops.
Always dose by weight when known, as it is more accurate. Age-based dosing on product labels is a rough guide based on average weight for age. Children who are significantly above or below average weight for their age may be over or under-dosed with age-based recommendations.
Check all other medications for acetaminophen content. Many cold, flu, and pain combination products contain acetaminophen. Taking multiple acetaminophen-containing products simultaneously is a common cause of unintentional overdose in children.
If the child vomits within 15-20 minutes, the dose likely was not absorbed and can be repeated. If vomiting occurs more than 30 minutes after dosing, most of the medication has been absorbed and should not be re-dosed. Wait for the next scheduled dose.
Yes. Generic acetaminophen is bioequivalent to brand-name Tylenol and equally effective. The key is to check the concentration (mg/mL) on the label, as it should be the same (160 mg/5 mL for pediatric liquid formulations) regardless of brand.
Store at room temperature (20-25°C or 68-77°F), away from direct heat and light. Do not refrigerate unless the label specifies. Shake well before each use. Check the expiration date and discard expired medication. Keep out of reach of children.
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