Antimicrobial agents and chemotherapy

The group includes medicines against bacteria, viruses and fungi. They do not all work interchangeably, and taking a leftover or borrowed product can delay appropriate assessment.

Chemotherapy can temporarily reduce infection-fighting white blood cells or disrupt protective barriers in the mouth, bowel and skin. An infection may then progress with fewer local signs than expected. The care team considers the chemotherapy regimen, blood results, symptoms, examination and likely source before choosing treatment.

An antimicrobial may be prescribed as prevention for a defined period or as treatment for a suspected or confirmed infection. Samples such as blood, urine or a swab can help identify an organism and guide a change in medicine. Preventive treatment does not replace urgent assessment of fever or illness.

Take each medicine exactly as directed and check what to do if a dose is missed or vomiting follows a dose. Share a complete list of cancer medicines, other prescriptions, supplements and allergies because interactions can change drug levels or side effects. Do not keep unused antimicrobials for a future illness.

Use careful hand hygiene, protect any line or wound as instructed, and avoid close contact with people who are acutely unwell. Check your temperature when you feel feverish or shivery, using the method recommended by your treatment unit.

Contact the oncology emergency number immediately for a temperature at or above the threshold your unit provided, shaking chills, new confusion, burning urine, worsening cough, shortness of breath, uncontrolled diarrhoea, or redness and discharge around a line. Call even if you already take an antimicrobial.

Use emergency services for severe breathing difficulty, blue or grey lips, collapse, extreme drowsiness or rapidly worsening illness. Avoid taking a fever-reducing medicine merely to postpone contacting the cancer team, because it can mask a useful warning sign.

Confirm your personal temperature threshold, the round-the-clock contact number, whether preventive treatment is planned, and which interactions apply to your medicines. Ask whether any vaccines, dental work or travel plans need to be timed around chemotherapy.