Q: Can my child's fever return 24 hours after receiving a Peramiflu IV for Influenza A?
- Myeongchan Kim
- 6 hours 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 child was diagnosed with Influenza A on Saturday morning. They received Peramiflu (an IV antiviral) and a fever-reducing injection. The fever went down initially, but by the evening, it suddenly spiked back up to 38.1°C (100.6°F). I thought the fever was completely under control since 24 hours had passed. Is it normal for a fever to return even after 24 hours have passed?
Answer:
I understand you must be worried about your child's fever returning in the evening after receiving treatment earlier that day.
Understanding the Current Situation
Even after receiving Peramiflu (an IV antiviral treatment), it is very common for a fever to fluctuate for 24 to 48 hours. While the antiviral medication works to stop the flu virus from multiplying, the body's ongoing inflammatory response to the infection can still cause a fever to linger for another day or two.
What to Do at Home Right Now
Monitor if Comfortable: If the fever is around 38.1°C (100.6°F) and your child does not seem irritable or uncomfortable, you can simply observe them without giving fever-reducing medication.
Manage Discomfort: If your child is uncomfortable, you can administer acetaminophen or ibuprofen. Make sure to dose based on their weight, carefully checking the label for the correct calculation.
Keep Them Comfortable: Dress your child in lightweight clothing, keep the room at a comfortable temperature, and encourage frequent, small sips of fluids to maintain hydration.
Avoid Physical Cooling: Do not use physical cooling methods such as lukewarm towel sponge baths or ice packs.
When to Visit Urgent Care or the ER Immediately
Please seek emergency medical care if your child experiences any of the following:
Shortness of breath or the skin pulling in under their ribs (retractions) while breathing.
No urination for 8 hours or more.
Extreme lethargy (only wanting to sleep) or difficulty making eye contact.
A persistent fever of 39°C (102.2°F) or higher that does not respond to fever-reducing medications.
When to Follow Up with Your Pediatrician
If a fever of 38.5°C (101.3°F) or higher continues to recur two or more times a day by Monday, consult your pediatrician for a re-evaluation.
If any new symptoms develop—such as ear pain, a worsening cough, or vomiting—see your doctor promptly.
Keep a close eye on your child's symptoms over the next day or two, and do not hesitate to seek an in-person medical evaluation if their condition worsens or if you remain concerned.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
