Q: My child vomited right after taking acetaminophen for a fever. Can I give another dose?
- Myeongchan Kim, MD
- Jun 20
- 2 min read
Updated: Jul 8
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:
Early this morning, my child suddenly vomited and had a fever of 38.2°C. I gave them acetaminophen at 3:46 AM, but they threw it all up. Now, their temperature has gone up to 38.6°C. Is it safe to give them another dose of the fever reducer right away?
Answer:
It can be very alarming when your child has a fever and vomits their medication in the middle of the night. Based on your current situation, here are the guidelines for readministering the fever reducer:
Guidelines for Readministration:
If they vomited within 30 minutes: If your child threw up the entire amount of the medication within 30 minutes of taking it, you can safely give the same dose again.
If it has been more than 30 minutes (or partial vomiting): If more than 30 minutes passed before they threw up, or if they only vomited a portion of the medication, you must observe the standard 4-hour waiting interval. Since you gave the medicine at 3:46 AM, you should wait until after 7:46 AM for the next dose.
What to do in the meantime: If you need to wait before giving the next dose, dress your child in light, breathable clothing and maintain a comfortably cool room temperature. Offer small, frequent sips of lukewarm water to prevent dehydration. Do not use aggressive physical cooling methods (like cold baths).
Warning Signs:
Please take your child to an Urgent Care or Emergency Room immediately if you notice any of the following signs:
Continuous vomiting that makes them unable to keep any fluids down.
No urine output for more than 8 hours.
Shortness of breath or the skin pulling in under the ribs when breathing (retractions).
Extreme lethargy or difficulty waking them up.
A stiff neck, severe headache, or a new rash.
If your child's symptoms persist during the day, please contact your pediatrician for an evaluation. If it is after hours or on a holiday, do not hesitate to visit a local urgent care clinic or emergency room.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
