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  2. dictionary.cambridge.org › dictionary › englishDRUG | English meaning - Cambridge Dictionary

    DRUG definition: 1. any natural or artificially made chemical that is used as a medicine: 2. any natural or…. Learn more.

  3. www.merriam-webster.com › dictionary › drugDrug Definition & Meaning - Merriam-Webster

    The meaning of DRUG is a substance used as a medication or in the preparation of medication. How to use drug in a sentence.

  4. en.wikipedia.org › wiki › DrugDrug - Wikipedia

    A drug is any chemical substance other than a nutrient or an essential dietary ingredient, which, when administered to a living organism, produces a biological effect. [1] Consumption of drugs can be via inhalation, injection, smoking, ingestion, absorption via a patch on the skin, suppository, or dissolution under the tongue.

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  6. www.britannica.com › science › drug-chemical-agentDrug | Definition, Types, Interactions, Abuse, & Facts ...

    • Overview
    • Mechanisms

    drug, any chemical substance that affects the functioning of living things and the organisms (such as bacteria, fungi, and viruses) that infect them. Pharmacology, the science of drugs, deals with all aspects of drugs in medicine, including their mechanism of action, physical and chemical properties, metabolism, therapeutics, and toxicity. This article focuses on the principles of drug action and includes an overview of the different types of drugs that are used in the treatment and prevention of human diseases. For a discussion of the nonmedical use of drugs, see drug use.

    Until the mid-19th century the approach to drug therapeutics was entirely empirical. This thinking changed when the mechanism of drug action began to be analyzed in physiological terms and when some of the first chemical analyses of naturally occurring drugs were performed. The end of the 19th century signaled the growth of the pharmaceutical industry and the production of the first synthetic drugs. Chemical synthesis has become the most important source of therapeutic drugs. A number of therapeutic proteins, including certain antibodies, have been developed through genetic engineering.

    Drugs produce harmful as well as beneficial effects, and decisions about when and how to use them therapeutically always involve the balancing of benefits and risks. Drugs approved for human use are divided into those available only with a prescription and those that can be bought freely over the counter. The availability of drugs for medical use is regulated by law.

    Drug treatment is the most frequently used type of therapeutic intervention in medicine. Its power and versatility derive from the fact that the human body relies extensively on chemical communication systems to achieve integrated function between billions of separate cells. The body is therefore highly susceptible to the calculated chemical subversion of parts of this communication network that occurs when drugs are administered.

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    With very few exceptions, in order for a drug to affect the function of a cell, an interaction at the molecular level must occur between the drug and some target component of the cell. In most cases the interaction consists of a loose, reversible binding of the drug molecule, although some drugs can form strong chemical bonds with their target site...

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  7. www.health.gov.au › topics › drugsWhat are drugs? - Department of Health and Aged Care

    Drugs are substances that change a person’s mental or physical state. They can affect the way your brain works, how you feel and behave, your understanding and your senses. This makes them unpredictable and dangerous, especially for young people. The effects of drugs are different for each person and drug.

  8. www.who.int › health-topics › drugs-psychoactiveDrugs (psychoactive) - World Health Organization (WHO)

    Aug 8, 2023 · Drugs. Home / Health topics / Drugs (psychoactive) Overview. Psychoactive drugs are substances that, when taken in or administered into one's system, affect mental processes, e.g. perception, consciousness, cognition or mood and emotions.

  9. dictionary.cambridge.org › learner-english › drugMeaning of drug – Learner’s Dictionary - Cambridge Dictionary

    DRUG definition: 1. an illegal substance that people take to make them feel happy: 2. a chemical substance used as…. Learn more.

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