Q: My child has an evening fever for 5 days. Do we need an X-ray for pneumonia, and is it okay if they take 30 minutes to finish their medicine?
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:
Hello doctor,
My child is currently taking medication, including antibiotics, for cold symptoms like a cough, runny nose, and sore throat. For the past 5 days, they have been getting a fever of around 38.2°C every evening, so I add a fever reducer to their nighttime dose. Because the total volume of the medicine is quite large, my child can't take it all at once, and it takes them a while to finish it. (They are also gassy and not eating well, possibly due to the antibiotics, but there are no signs of dehydration.)
I have two questions:
The highest fever recorded was 38.4°C. For 5 days now, a mild fever (around 37.7°C) starts in the afternoon, and peaks at about 38.2°C somewhere between 8 PM and dawn. The cough is quite severe and seems to be caused by postnasal drip, but it doesn't sound like a wet, chesty cough. Should I suspect Mycoplasma pneumonia and get them tested? The doctor previously said their lung sounds were clear, but I'm wondering if we need an X-ray.
It takes my child about 30 minutes to finish a single dose of medicine because I have to give it to them little by little. Does spacing it out like this make the medication less effective?
Thank you for your help!
Answer:
It is completely understandable that you are worried after seeing your child experience evening fevers and coughing for 5 days.
Here is a summary of your child's current situation:
• A fever peaking at 38.4°C (mostly evening/night around 38.2°C), with normal temperatures or mild fever during the day.
• Cough (suspected postnasal drip), runny nose, and sore throat.
• Currently taking antibiotics, experiencing gas and reduced appetite, but no dehydration.
• Taking about 30 minutes to finish a dose of medication.
Here are the answers to your questions:
Do you need a Mycoplasma test or a chest X-ray?
You should seek immediate in-person medical evaluation today if you notice any of the following red flag symptoms:
• Fast breathing (more than 40 breaths/minute for children 5 and under; more than 30 breaths/minute for children 6 and older).
• Chest retractions (skin pulling in under the ribs) or nasal flaring while breathing.
• A bluish tint to the lips or fingernails.
• Refusing all food and liquids, with no urination for over 8 hours.
• Fever lasting more than 7 days, or symptoms progressively worsening.
• The child is extremely lethargic, constantly lying down, and unresponsive.
If none of the above signs are present and the doctor recently noted clear lung sounds:
→ It is standard medical practice to observe the child's response to the current antibiotics for another 48 to 72 hours.
→ If this is a Mycoplasma infection, symptoms usually begin to improve 2 to 3 days after starting the correct antibiotics. Since you are on day 5 of the illness, the key is to watch if the fever starts to break over the next day or two.
→ A chest X-ray is generally only necessary when the results would change the actual treatment plan. You can ask your pediatrician at your next visit if an X-ray is clinically necessary at this stage.
Tips to manage the postnasal drip at home:
• Use saline nasal sprays or drops 3-4 times a day.
• Elevate your child's upper body by 15-30 degrees while they sleep.
• Maintain indoor humidity between 40-60%.
• Give 1 teaspoon of honey before bedtime (only if the child is strictly over 1 year of age).
Is it okay to take 30 minutes to finish the medicine?
Yes, it is perfectly fine for both the antibiotics and the fever reducers.
• For antibiotics, as long as the total daily dosage and the intervals between doses (usually every 8-12 hours) are maintained, taking up to 30 minutes to consume a single dose will not reduce its effectiveness.
• Fever reducers (like Acetaminophen or Ibuprofen) also remain fully effective even if it takes up to an hour to finish the dose.
Tips to help with medication administration and gastrointestinal side effects:
• Offer a very small, bland snack (like a cracker or a bite of banana) 30 minutes before giving the medicine to help prevent nausea.
• Continue giving the medicine in small increments (e.g., 5mL at a time, every 2-3 minutes).
• Since the antibiotics are causing gas and poor appetite, consider giving your child a pediatric probiotic. Administer the probiotic at least 2 hours before or after the antibiotic dose to help alleviate gas and support gut health.
Actionable Guidance:
Monitor your child closely for any of the red flag symptoms mentioned above (labored breathing, no urine for 8+ hours, extreme lethargy, or fever crossing the 7-day mark). If none of these severe signs appear, continue the current medication routine (spacing it out over 30 minutes is fine) and observe their progress for the next 1 to 2 days. If the fever and cough do not show signs of improvement after this observation period, please follow up with your pediatrician for a re-evaluation.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
