Fever after starting antibiotics

Antibiotics treat certain bacteria, not viruses, and fever may continue while inflammation settles. The prescribed drug may also need review if the diagnosis changes, bacteria are not sensitive to it, doses were missed, or an abscess needs drainage. A new fever can be a medicine reaction or a separate illness. Conditions sometimes treated with antibiotics include cellulitis, acute bronchitis in selected cases, and Helicobacter pylori infection, but treatment plans differ.

Take each dose exactly as prescribed and do not double a missed dose unless instructed. Do not stop early, share tablets or use another person’s supply. Drink enough to avoid dehydration, rest, and record temperature, doses and new symptoms. Contact the prescriber if fever is not improving as expected, returns after improvement, or side effects interfere with treatment. Ask before combining fever medicine with other products.

Seek emergency help for trouble breathing, swelling of the lips or face, fainting, confusion, or a widespread blistering rash after a dose. Get prompt assessment for severe diarrhoea, repeated vomiting, severe pain, rapidly spreading redness, or a person who becomes markedly weak. A clinician may need to examine the infection, review the medicine and decide whether testing or a different treatment is needed.

Ask what improvement should look like, when to report persistent fever, whether food changes absorption, what to do after a missed dose, and which symptoms could signal an allergic reaction.