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Drugs

 A drug is any substance that causes a change in an organism's physiology or psychology when consumed. Drugs are typically distinguished from food and substances that provide nutritional support. Consumption of drugs can be via inhalationinjectionsmokingingestionabsorption via a patch on the skin, or dissolution under the tongue.

In pharmacology, a drug is a chemical substance, typically of known structure, which, when administered to a living organism, produces a biological effect. A pharmaceutical drug, also called a medication or medicine, is a chemical substance used to treatcureprevent, or diagnose a disease or to promote well-being.

Relevant Topics in Pharmaceutical Sciences