Antibiotics work by changing certain processes (like energy production or growth) inside bacteria. There are two main ways they can do this:
1) Kill the bacteria directly by, for example, stopping them from being able to make energy, or being able to make a cell wall (which keeps all their insides in). This is called a bactericidal antibiotic.
2) Stop the bacteria from being able to reproduce or grow. This is called a bacteriostatic antibiotic.
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