In this section, we'll explore drugs, antibiotics, and the critical issue of antibiotic resistance. Let's start with the fundamental definition of a drug.

For your iGCSE course, a drug is defined as any substance taken into the body that modifies or affects chemical reactions within it.

Now let's look at a specific type of drug: antibiotics. Antibiotics are medicines used to treat infections caused by bacteria. They work in two main ways: either by killing the bacteria directly, or by inhibiting their growth and reproduction.