Question

What do you mean by drug?

Answer 1

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A drug is any chemical you take that affects the way your body works. Alcohol, caffeine, aspirin and nicotine are all drugs. A drug must be able to pass from your body into your brain. Once inside your brain drugs can change the messages your brain cells are sending to each other and to the rest of your body. They do this by interfering with your brain's own chemical signals: neurotransmitters that transfer signals across synapses.

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Answer 2

Answer:

A chemical substance that shows effect on the body by altering the physiological function of the body when injected into a patient or a person.

Explanation:

Now a days the word drug is used in two ways.

In a positive way a drug is explained as the medicine taken in by the patient in order to to get relieved of his illness.

In a negative way nowadays word drug is used for the chemical substances which alter the brain messages and and bring Trance condition to the person who take it it like cocain, alcohol, heroine, caffeine etc.