Antibiotics for asthma: what patients should know

Asthma involves inflamed, sensitive airways and is usually managed with inhaled medicines and an action plan. Antibiotics target susceptible bacteria; they do not open tightened airways or replace a reliever inhaler.

Cough, wheeze and chest tightness can worsen during a viral respiratory illness, when antibiotics offer no benefit. A clinician considers the symptom pattern, examination findings and, when appropriate, tests before deciding whether a bacterial infection is also present.

Coloured mucus alone cannot confirm a bacterial infection. Unnecessary antibiotics can cause diarrhoea, nausea, rash or an allergic reaction and can make bacteria harder to treat later.

Follow your written asthma action plan and use inhalers exactly as directed. Check that your technique and spacer use are correct, avoid known triggers, and arrange a clinical assessment if symptoms are not settling or you suspect an infection.

If an antibiotic is prescribed, follow its label, complete the instructed course, and do not share leftovers. Tell the prescriber about medicine allergies, pregnancy, kidney or liver problems, and other medicines you take.

Seek emergency help for severe breathlessness, difficulty speaking in full sentences, blue or grey lips, confusion, faintness, marked exhaustion, or symptoms that keep worsening despite the reliever steps in your action plan.

Get prompt medical advice for fever with worsening breathing, chest pain, coughing up blood, dehydration, or a new rash or swelling after starting an antibiotic. Sudden facial or throat swelling, wheezing after a dose, or trouble breathing can signal a serious allergic reaction.

Ask what findings suggest a bacterial infection, how the antibiotic should be taken, which side effects require help, and whether your asthma action plan needs changing. You can also request an inhaler-technique check and clear instructions for what to do if breathing deteriorates.