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  1. A basic overview of each product is provided (including dosages, possible drug interactions, side effects and contraindications) along with safety and/or efficacy ratings. Quickly and easily find your medication from our A to Z list of over 24,000 prescription and OTC drugs.

  2. 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. Psychoactive drugs belong to a broader category of psychoactive substances that include also alcohol and nicotine.

  3. Video series highlights how FDA regulates and approves drugs. Learn how the agency uses science and data to ensure drug safety, quality and efficacy.

  4. Latest Drug News. WebMD's comprehensive database of prescription drug and medication information from A to Z.

  5. VIEW PROFESSIONAL VERSION. More Information. A drug is defined by U.S. law as any substance (other than a food or device) intended for use in the diagnosis, cure, relief, treatment, or prevention of disease or intended to affect the structure or function of the body. (Oral contraceptives are an example of drugs that affect the function of the ...

  6. June 2018 | Provides an overview of drug use and addiction, including what happens in the brain during drug use, why some people become addicted while others don't, and the importance of prevention.

  7. Jun 6, 2018 · Provides an overview of drug use and addiction, including what happens in the brain during drug use, why some people become addicted while others don't, and the importance of prevention.

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