What to know about antipseudomonal antibiotics

They are not one medicine or a routine choice for every infection. The site and severity of infection, culture results, allergies, kidney function and local resistance patterns help determine the drug, route and duration.

Pseudomonas aeruginosa can cause infections in the lungs, urinary tract, wounds, skin, blood or medical devices, particularly when normal defences are reduced. It naturally resists many common antibiotics and can acquire further resistance, so a medicine that treats another bacterium may not work against it.

A sample from the suspected site may be cultured and tested for susceptibility. Clinicians sometimes begin broad treatment when illness is severe, then narrow or change it when laboratory results and the clinical response are available. Some infections need tablets, while others require intravenous medicine, drainage, wound care or removal of an infected device.

Take the prescribed dose at the stated times and complete the plan unless the treating clinician changes it. Do not use leftover antibiotics or share them. Before treatment, report antibiotic allergies, kidney or hearing problems, pregnancy, and all medicines or supplements because these details can alter selection and monitoring.

If a sample was requested, provide it before the first dose when the care team says it is safe to wait. Attend any blood tests or follow-up appointments arranged to check kidney function, medicine levels or response. Contact the prescriber if doses are missed, vomiting prevents absorption, or symptoms are not improving as expected.

Get emergency help for trouble breathing, swelling of the face or throat, collapse, a widespread blistering rash, confusion, blue or grey lips, or rapidly worsening weakness. Severe breathlessness, very low urine output, or signs of shock also need immediate assessment.

Seek prompt advice for persistent vomiting, severe watery or bloody diarrhoea, new ringing in the ears, hearing change, unusual tingling, tendon pain, worsening redness around a wound, or fever that returns. The relevant risks vary between antibiotics, so use the medicine leaflet and the prescriber's specific safety instructions.

Ask whether Pseudomonas was confirmed or is only suspected, which sample is being tested, and when results may change treatment. Clarify the route and planned duration, interactions with your medicines, monitoring needs, and the exact symptoms that should bring you back sooner.