Q: My 18-month-old has had a fever for 4 days due to Mycoplasma. How long can I give fever reducers safely, or should we be hospitalized?
Updated: Sep 7
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 18-month-old child (11 kg) was hospitalized for Mycoplasma pneumonia in October. On Monday, my child started running a fever of 38°C, and it is still ongoing today, Thursday (though it has dropped from 39°C to the 38°C range). A blood test showed no high inflammation markers, but the Mycoplasma level increased. Since my child is energetic and eating well, the doctor advised against hospitalization. However, I am giving my child fever reducers 3 to 4 times a day. We have never used fever reducers for this long before. How long is it safe to continuously give fever reducers? Would it be better to be hospitalized just to bring the fever down?
Answer:
It is completely understandable that you are worried after seeing your child endure a high fever for several days.
To summarize your current situation: Your 18-month-old (11 kg) has had a fever of 38–39°C for 4 days. The Mycoplasma levels are elevated, but inflammation markers are normal. Because your child is active and eating well, hospitalization has been put on hold, and you are currently giving fever reducers 3 to 4 times a day.
How Long Can You Use Fever Reducers?
With Mycoplasma pneumonia, it is common for a fever to persist for a few days even after starting antibiotics.
As a general rule, fever reducers (like acetaminophen or ibuprofen) should be used only when the child is uncomfortable. However, if your child is struggling with the high fever, giving the medication 3 to 4 times a day is well within the safe range.
As long as you strictly adhere to the proper dosage intervals and the maximum daily dosage limits for the specific medication, it is safe to administer them for a week or more if necessary.
Home Care Guidelines:
Hydration: Offer fluids frequently and monitor urine frequency and color.
Comfort: Dress your child in light clothing and maintain a comfortable room temperature.
Medication: Use fever reducers only when the child appears physically uncomfortable, rather than fixating on the exact number on the thermometer.
Breathing Checks: Monitor your child's breathing rate. For an 18-month-old, if the breathing rate exceeds 40 breaths per minute or if the area under the ribs retracts (sinks in) when breathing, you should have the child re-evaluated by a doctor on the same day.
When to Visit the Hospital Immediately:
Seek urgent medical care if any of the following occur:
Breathing becomes rapid or looks difficult (wheezing, grunting, or chest retractions).
There is no urine output for more than 8 hours.
The child becomes suddenly lethargic or is difficult to wake up.
The fever lasts for 5 days or more, or spikes back up to 39°C or higher.
Hospitalization vs. Outpatient Care:
Since your child is currently eating well, staying active, and has normal inflammation markers, outpatient observation is a very reasonable and standard approach. Hospitalization is typically considered when a child needs supplemental oxygen, becomes severely dehydrated, or cannot take oral medications.
I recommend calling or visiting your attending pediatrician to ask specifically when they expect the antibiotics to take full effect and at what point a prolonged fever would require an in-person re-evaluation. Please continue to monitor the key points mentioned above. If any signs of breathing difficulty or dehydration appear during nights or weekends, please visit your local emergency room immediately.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
