Drug

What is Drug?

Any substance taken into the body that modifies or affects chemical reactions in the body. The definition is deliberately wide: it includes medicines such as antibiotics as well as substances such as alcohol and nicotine, and it says nothing about whether a substance is legal or harmful.

This definition is part of the Disease and Immunity chapter in Cambridge O Level Biology.

Concepts related to Drug

• Antibiotic
• Depressant
• nicotine