How Medicine Helps
Drugs alone do not cure infections or other disorders. The purpose of drugs is to help the body to recover itself; they facilitate self-repair.
For example, a cat may develop a bite abscess after a fight, and bacteria from that abscess may escape and enter the cat's general circulation, causing malaise and an associated fever and lack of appetite.
Antibiotics can help to destroy the bacteria, but at the same time repairs to the damage caused by the infection must be undertaken.
The antibiotics give the body's immune system the time it needs to prepare its counter-attack, to deploy the natural killer cells, scavenging macrophage cells, and other components of the immune system.
The real source of repair is the immune system; it is aided and abetted by modern medicine.