Chest infection and cough
A cough with chesty mucus is usually caused by a virus and can last 3–4 weeks even after the infection has gone.
How long does a course usually last?
When antibiotics are needed, usually a 5-day course.
Your prescriber sets the exact length for you. Finish the course you're given unless a healthcare professional tells you to stop.
Never re-use antibiotics
- Do not re-use this treatment, or take leftover or someone else's antibiotics, unless a healthcare professional has expressly told you to.
- The right antibiotic, dose and length depend on your current infection, which can be different from last time.
- Re-using antibiotics can be ineffective, cause side effects, and drives antibiotic resistance. Return leftovers to any pharmacy for safe disposal.
What the guidance says
NICE says most chest infections and coughs (acute bronchitis) do not need antibiotics. A backup prescription may be given. Antibiotics are more likely to be offered for people with lung conditions such as COPD, or for those at higher risk of complications. Pneumonia is different and is covered on its own page.
Based on NICE guidance — always follow your own prescriber's advice.
Antibiotics sometimes prescribed
When to seek help
If you are getting worse, develop a high fever, feel confused or breathless, or your symptoms are not improving as expected, contact your doctor or call NHS 111. See the warning signs page.