At a glance
- Spectrum describes which groups of bacteria a medicine may act against.
- Broad- and narrow-spectrum treatments each have a place.
- Coverage depends on the bacterium, infection site and resistance patterns.
- Never use a spectrum chart to choose a prescription for yourself.
Broad and narrow, in plain English
A broad-spectrum antibiotic is active against a wider range of bacteria. A narrow-spectrum antibiotic has a more focused range. Clinicians consider the likely bacteria, test results and the whole person when choosing or adjusting treatment.
Five medicines to explore
These introductory medicine pages cover colistin, fosfomycin, nitrofurantoin, minocycline and rifampicin. They are here because these medicines featured in the former AIDA research project, not because this site recommends them for any reader.
Medicine information differs by country, formulation and indication. Always use your own leaflet and professional advice for personal questions.
Why appropriate selection matters
Using an antibiotic where it is not useful can cause side effects and contribute to resistance. Laboratory testing may help identify which medicines a bacterium is susceptible to, but results still need clinical interpretation.
Sources
Original referencesThese sources informed this overview. Their organisations do not endorse or review this website.
This page is for general education only. It does not replace advice from a doctor, pharmacist or other qualified healthcare professional. Read our medical disclaimer.