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Glossary of terms

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Receptors

Cells in the brain that are sensitive to particular drugs; for example, the effects of heroin are experienced once the drug attaches itself to the opioid receptor in the brain.

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Recreational drug use

Use of drugs for leisure, pleasure or social reasons. Often used to refer to the use of "party drugs".

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Relapse

A recurrence of harmful drug use after a period of improvement. Relapse is common among people who are drug-dependent when they are attempting to stop drug use.

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Risk reduction

Policies or programs that focus on reducing the risk of harm from alcohol or other drug use.

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Rohypnol

A powerful benzodiazepine that induces sleep.

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Rush

Sudden onset of euphoria after injection of heroin or cocaine.

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