A fever that doesn’t budge after medication is stressful, but in most cases it doesn’t mean something is seriously wrong. Fever-reducing medicine isn’t designed to bring a temperature back to normal. It typically lowers it by 1 to 2 degrees and helps your child feel more comfortable. If the number on the thermometer is still high after a dose, focus on how your child looks and acts rather than the number itself.
Why the Fever Isn’t Dropping
Fever is your child’s immune system fighting an infection, and some infections simply produce stubborn, high fevers. Common culprits include ear infections, flu, tonsillitis, roseola (a virus known for days of high fever followed by a rash), urinary tract infections, and upper respiratory infections. These are all normal childhood illnesses, and the fever they cause can spike repeatedly for several days even with treatment.
The most common reason a fever “won’t go down” is that the medication needs more time. Acetaminophen takes about 30 to 60 minutes to start working, and ibuprofen can take a similar window. If you check the temperature 15 minutes after giving medicine and it’s the same, that’s expected. Give it a full hour before deciding the dose didn’t help.
Another possibility: the dose is too low. Both acetaminophen and ibuprofen are dosed by weight, not age. If your child has grown since you last checked the dosing chart, the amount that worked six months ago may not be enough now.
Medication Timing and Limits
Acetaminophen can be given every 4 to 6 hours, with a maximum of 5 doses in 24 hours. Do not give it to infants under 8 weeks old. Ibuprofen can be given every 6 to 8 hours, with a maximum of 4 doses in 24 hours. Do not give ibuprofen to babies under 6 months old unless directed by a doctor.
You may have heard about alternating acetaminophen and ibuprofen every few hours. While some doctors suggest this, the American Academy of Family Physicians cautions against it. There’s no evidence that alternating is more effective than using one medication alone, the rotating schedule is easy to mix up, and confusion about timing raises the risk of accidentally giving too much. If you’re going to use both, a simpler approach is to stick with one as your primary medication and only reach for the other if the fever is still causing significant discomfort after the first dose has had time to work. Always track what you gave and when.
What to Do While You Wait
Keep your child lightly dressed. A single layer of clothing and a light blanket are enough. Bundling a feverish child in heavy blankets traps heat and can push the temperature higher. Offer small, frequent sips of water, breast milk, formula, or an electrolyte solution. Popsicles and cold fruit work well for older kids who refuse a cup.
A lukewarm (not cold) washcloth on the forehead or a lukewarm bath can provide some comfort. Avoid cold water or rubbing alcohol, both of which can cause shivering. Shivering actually generates more body heat and works against you.
Watch for Dehydration
Fever increases fluid loss, and a sick child who doesn’t feel like drinking can become dehydrated quickly. The signs to watch for are specific and easy to check: no wet diapers for three hours or more, no tears when crying, and skin that stays pinched or “tented” when you gently pinch the back of the hand instead of flattening back right away. A dry mouth and unusual sleepiness are also red flags. If you see these signs together, your child needs medical attention for fluids.
Temperature Thresholds That Matter
Not all fevers carry the same urgency. Age changes the math significantly.
- Under 3 months: A rectal temperature of 100.4°F (38°C) or higher needs immediate medical evaluation, regardless of how your baby looks. Young infants can have serious infections with very few outward symptoms.
- 3 to 6 months: A temperature up to 101°F (38.3°C) warrants a call to your pediatrician if your baby seems unusually irritable, limp, or uncomfortable. Anything above 101°F at this age also needs a call.
- 6 to 24 months: A temperature above 101°F that lasts longer than one full day, even without other symptoms, should be evaluated.
- Over 2 years: The number matters less than the behavior. A child with a 103°F fever who is drinking fluids and playing is generally in less danger than a child with a 101°F fever who is limp and unresponsive.
What a Febrile Seizure Looks Like
Some children experience seizures triggered by fever, and seeing one for the first time is terrifying. The child’s body stiffens, then jerks rhythmically on both sides. Their eyes may roll back, and they won’t respond to you. A simple febrile seizure lasts less than 15 minutes and doesn’t repeat within 24 hours. Most last only a minute or two.
If it happens, lay your child on their side on a flat surface, away from anything they could hit. Do not put anything in their mouth. Time the seizure with your phone. If it lasts longer than 5 minutes, call emergency services. After a first febrile seizure, contact your pediatrician even if your child seems fine afterward. Febrile seizures are frightening but rarely cause lasting harm. A seizure that lasts longer than 15 minutes, affects only one side of the body, or happens more than once in a day is considered complex and needs prompt neurological follow-up.
Signs That Need Emergency Care
Most childhood fevers resolve on their own within a few days. But certain symptoms alongside a fever signal something more serious, like meningitis, a blood infection, or pneumonia. Get emergency care if your child has any of the following with a fever:
- Stiff neck or pain when bending the head forward
- Rash that doesn’t fade when you press on it (roll a glass over it to check)
- Unusual sensitivity to light
- Confusion, strange behavior, or altered speech
- Persistent vomiting
- Difficulty breathing or chest pain
- Seizure
- Listlessness or poor eye contact, where the child seems “not there”
Also seek immediate care if the fever developed after your child was left in a hot car, as that involves heat stroke rather than infection and requires a completely different response.
How Long a Fever Normally Lasts
Most viral fevers peak in the first 2 to 3 days and resolve within 5 days. Some infections, like roseola, can cause a high fever for 3 to 5 days before breaking suddenly (often right as the rash appears). Flu fevers tend to be higher and more persistent than cold fevers, sometimes lasting up to a week. A fever that persists beyond 5 days, or one that goes away and then returns after a day or two without fever, is worth a visit to your pediatrician. The return of fever can signal a secondary bacterial infection, like an ear infection developing on top of a cold.
Through all of this, keep reminding yourself: the fever itself is not the enemy. It’s a tool your child’s body is using to fight infection. Your job is to keep them comfortable, hydrated, and watched for the warning signs above.