Q.What is meant by the "judicious use" of antibiotics, and why is completing a full prescribed course important even after symptoms disappear?

[!TLDR] Judicious use = taking antibiotics only for bacterial infections and completing the full course; stopping early can leave resistant survivors that cause a harder-to-treat relapse. …

Judicious use of antibiotics means taking them only when genuinely needed -- for confirmed or strongly suspected bacterial infections, never for viral illnesses such as the common cold, against which antibiotics have no effect -- and, when prescribed, taking the full course exactly as directed, at the correct dose and for the full duration, rather than stopping as soon as symptoms improve. Completing the full course matters because symptoms typically improve well before every targeted bacterium in the body has actually been killed: the most susceptible bacteria die first, while a smaller number of relatively more resistant bacteria may survive longer. If the antibiotic course is stopped early, these surviving, comparatively resistant bacteria are left alive, free to multiply and potentially …

Define judicious use in both its parts (right indication + full course), then explain the specific biological reasoning (susceptible-first die-off le …

Many students know 'finish the course' as a rule without understanding WHY -- the key reasoning is that stopping early selective …