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Neurology and Neurosurgery/Drugs
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A drug is any chemical substance that when consumed causes a change in an organism's physiology, including its psychology, if applicable.[1][2][vague] Drugs are typically distinguished from food and other substances that provide nutritional support. Consumption of drugs can be via inhalation, injection, smoking, ingestion, absorption via a patch on the skin, suppository, or dissolution under the tongue.