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Fever treatment: Quick guide to treating a fever

By Mayo Clinic staff

A fever is a common sign of illness, but that's not necessarily a bad thing. In fact, fevers seem to play a key role in fighting infections. So should you treat a fever or let the fever run its course? Here's help making the call.

AgeTemperatureWhat to do
Infants
Birth to 3 months 100.4 F (38 C) or higher taken rectally Call the doctor, even if your child doesn't have any other signs or symptoms.
3 months to 23 months Up to 102 F (38.9 C) taken orally Encourage your child to rest and drink plenty of fluids. Medication isn't needed. Call the doctor if your child seems unusually irritable, lethargic or uncomfortable.
3 months to 23 months Above 102 F (38.9 C) taken orally Give your child acetaminophen (Tylenol, others). If your child is age 6 months or older, ibuprofen (Advil, Motrin, others) is OK, too. Read the label carefully for proper dosage. Don't give aspirin to anyone age 18 or younger. Call the doctor if the fever doesn't respond to the medication or lasts longer than one day.
Children
2 years to 18 years Up to 102 F (38.9 C) taken orally Encourage your child to rest and drink plenty of fluids. Medication isn't needed. Call the doctor if your child seems unusually irritable or lethargic or complains of significant discomfort.
2 years through 18 years Above 102 F (38.9 C) taken orally Give your child acetaminophen or ibuprofen. Read the label carefully for proper dosage. Don't give aspirin to anyone age 18 or younger. Call the doctor if the fever doesn't respond to the medication or lasts longer than three days.
Adults
Older than 18 years Up through 102 F (38.9 C) taken orally Rest and drink plenty of fluids. Medication isn't needed. Call the doctor if the fever is accompanied by a severe headache, stiff neck, shortness of breath, or other unusual signs or symptoms.
Older than 18 years Above 102 F (38.9 C) taken orally If you're uncomfortable, take acetaminophen, ibuprofen or aspirin. Read the label carefully for proper dosage. Call the doctor if the fever doesn't respond to the medication, is consistently 103 F (39.4 C) or higher, or lasts longer than three days.
References
  1. Bobb B, et al. Fever and sweats. In: Walsh D, et al. Palliative medicine. Philadelphia, Pa.: Saunders Elsevier; 2009. http://www.mdconsult.com/das/book/body/171587449-4/0/2038/167.html?tocnode=57251154&fromURL=167.html. Accessed Nov. 16, 2009.
  2. Powell KR. Fever. In: Kliegman RM, et al. Nelson Textbook of Pediatrics. 18th ed. Philadelphia, Pa.: Saunders Elsevier; 2007. http://www.mdconsult.com/das/book/body/171587449-4/0/1608/510.html?tocnode=54478711&fromURL=510.html#4-u1.0-B978-1-4160-2450-7..50176-6_3974. Accessed Nov. 16, 2009.
ID00052 Jan. 5, 2010

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