Q: My child developed a fever after the first dose of antibiotics for sinusitis. Should we visit the clinic again tomorrow or wait?
Updated: 6 days ago
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:
I took my child to the doctor today for a cough, nasal congestion, and a runny nose, and the doctor suspected sinusitis. We were prescribed an antibiotic, and I gave the first dose this evening. However, now that my child is asleep, they seem to be developing a fever. Should I take them back to the clinic tomorrow, or should I continue giving the antibiotic and observe them at home?
Answer:
It is understandable to be concerned when your child develops a fever shortly after starting treatment. However, it is important to know that antibiotics do not work immediately.
Antibiotics typically take 48 to 72 hours to build up in the body and effectively reduce bacterial infection and fever. Because of this, it is very common for a fever to fluctuate or spike during the first one to two days of treatment.
What you can do at home right now:
Manage discomfort: If the fever makes your child uncomfortable, administer an age- and weight-appropriate fever reducer (such as acetaminophen or ibuprofen).
Supportive care: Dress your child in light, breathable clothing, maintain a comfortable room temperature, and offer frequent, small sips of fluids to keep them hydrated.
Continue the medication: Keep giving the antibiotic exactly as prescribed. Stopping or delaying doses can reduce effectiveness and increase the risk of antibiotic resistance.
When to seek medical evaluation tomorrow (or sooner):
You should contact your doctor or return to the clinic if you observe any of the following warning signs:
Difficulty breathing (breathing rapidly, nostrils flaring, or skin pulling in under the ribs).
Significant lethargy, abnormal drowsiness, difficulty waking, or inability to make eye contact.
Signs of dehydration, such as no wet diapers or urination for 8 hours or more.
Severe headache, a stiff neck, or repeated vomiting.
A fever that continues or worsens after 48 to 72 hours of consistent antibiotic use.
If your child does not show any of these red flags and remains relatively stable, it is generally appropriate to continue the prescribed antibiotic and monitor them at home for improvement over the next 2 to 3 days. If symptoms worsen at any point or if your child appears acutely unwell, consult your pediatrician or seek immediate medical care.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
