system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:How does an antibiotic know how to destroy infections in random places in the body?

How does the antibiotic even find the infection and does it just flat out kill infection?
gpt
It affects your whole body.  Some people suffer adverse affects after taking antibiotics because they can throw off your entire system.  We've got plenty of organisms in our bodies that are good for us.  Sometimes, they get caught in the crossfire.