Hi @sophie11xoxo
Wow, good question, but to answer it fully would take AGES. Different drugs have different effects, but the definition of a drug is a substance that alters body function.
Some drugs change the levels of chemicals in the brain, some can change physiological body responses like heart rate or blood pressure.
Let me know if you’d like to know about a specific drug, otherwise have a look at this great website which tells you about the effects of different drugs
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