Escherichia coli antibiotics: what to know

E. coli normally lives in the bowel, but some strains can cause diarrhoea, urinary infections, or other illness. A mild bowel infection may improve without antibiotics, and antibiotics can sometimes disturb healthy gut bacteria or prolong carriage of certain harmful toxins. A urine or bloodstream infection is assessed differently. A clinician may use a urine, stool, or blood sample to identify the organism and check which medicines are likely to work. Do not use leftover tablets or someone else’s prescription.

Drink regularly if you can keep fluids down, wash hands carefully after using the toilet, and follow the prescribed dose and timing if an antibiotic has been supplied. Complete the course unless the prescriber changes it. Ask about interactions with your regular medicines and report rash, swelling, severe diarrhoea, or breathing difficulty promptly. For a urinary infection, seek review if fever, flank pain, vomiting, or worsening symptoms appear.

Get urgent medical help for bloody diarrhoea, severe or persistent abdominal pain, confusion, fainting, very little urine, or signs of dehydration such as marked dizziness and a dry mouth. Babies, older adults, pregnant people, and anyone with reduced immunity may need earlier assessment. A high fever with shaking chills can signal an infection that needs prompt treatment.

Ask which infection is being treated, whether a sample was tested, what improvement should look like, and what to do if a dose is missed or side effects develop.