Fever and antibiotic medicine: what to know

Fever is an immune response, while antibiotics act against particular bacteria. Colds, bronchiolitis, croup, and many cases of acute bronchitis are viral, so an antibiotic may not help. A bacterial infection such as cellulitis can require antibiotic treatment, but symptoms and examination determine that decision.

Taking an unsuitable antibiotic can cause side effects and make it harder to choose treatment later. Leftover medicine, another person’s prescription, or an old prescription may be the wrong drug or amount for the current illness.

Ask a clinician or pharmacist whether the fever needs assessment and whether an antibiotic is appropriate. If one is prescribed, follow the instructions, check what to do about missed doses, and report a rash, facial swelling, breathing trouble, severe diarrhoea, or other concerning reaction promptly. Do not share antibiotics or save leftovers. Support recovery with fluids, rest, and a suitable fever medicine when advised.

Seek urgent help for breathing difficulty, confusion, fainting, a stiff neck, a seizure, severe pain, or a rapidly spreading rash. Contact a clinician when fever is worsening, persistent, or occurs in a young infant, an older person, someone pregnant, or a person with reduced immunity. Needing an assessment does not automatically mean an antibiotic is required.

Ask what infection is suspected, why an antibiotic is or is not useful, how to take it with other medicines, and what improvement or side effects should trigger a review.