Q: Fever reducer dosage for an 8-year-old child weighing 38kg: Can I give up to half of their body weight in ml?
- Myeongchan Kim, MD
- 12 minutes ago
- 2 min read
Medically reviewed by Sang Hyun Ahn, MD
Content edited by Myeongchan Kim, MD
This post is a dramatization of a question and answer session experienced by our actual medical reviewers. Please note that this content is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.
Question:
My 8-year-old child weighs 38 kg. Their fever spiked to 39°C at dawn, but it comes down to about 38°C during the day after taking a fever reducer. Their overall condition is fine. I've heard you can give up to half the child's body weight in milliliters for fever reducers. I currently gave them 15 ml, but I am wondering if it is safe to give up to 19 ml? We already got a flu test and it was negative, but they do have a very runny nose.
Answer:
I understand your concern about your child's fever spiking to 39°C. Based on your 8-year-old child's weight of 38 kg, here is a breakdown of the appropriate fever reducer dosages.
Depending on the exact medication you are using, the standard calculations are as follows:
• If using Acetaminophen (e.g., Tylenol, 32 mg/ml concentration): 15 ml equals 480 mg.
• If using Ibuprofen (20 mg/ml concentration): 15 ml equals 300 mg.
For a child weighing 38 kg, the recommended single-dose ranges are:
• Acetaminophen: 380–570 mg, which is about 12–18 ml (based on a 32 mg/ml concentration).
• Ibuprofen: 190–380 mg, which is about 9.5–19 ml (based on a 20 mg/ml concentration).
Since the 15 ml you already administered falls safely within the appropriate range for both common medications, it is not recommended to give an additional dose right now.
Instead, please follow these guidelines:
• Wait the proper interval (4 to 6 hours) before giving the next dose of the same medication.
• If a high fever returns before the next dose is due, you can cross-dose by alternating between Acetaminophen and Ibuprofen (maintaining the proper intervals for each respective medication).
• Dress your child in light, breathable clothing and ensure they drink plenty of water.
• Since you mentioned your child's overall condition is fine, you only need to administer fever reducers if they are experiencing discomfort.
It is a relief that the flu test was negative. Because they are experiencing a very runny nose, ensure they get plenty of rest and hydration to help clear the congestion.
Please visit a pediatrician for an in-person evaluation if you observe any of the following:
• A high fever that persists for more than 3 days.
• Difficulty breathing or chest pain.
• A severe headache or a stiff neck.
• Refusal to drink fluids, decreased urination, or other signs of dehydration.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
