![]() These drugs are divided into different groups like: stimulants, depressants, antidepressants, anxiolytics, antipsychotics, and hallucinogens. Psychoactive drugs are substances that affect the function of the central nervous system, altering perception, mood or consciousness. This classifies drugs according to their solubility and permeability or absorption properties. ![]() Another major classification system is the Biopharmaceutics Classification System. ![]() The Anatomical Therapeutic Chemical Classification System (ATC), the most widely used drug classification system, assigns drugs a unique ATC code, which is an alphanumeric code that assigns it to specific drug classes within the ATC system. Pharmaceutical drugs are often classified into drug classes-groups of related drugs that have similar chemical structures, the same mechanism of action (binding to the same biological target), a related mode of action, and that are used to treat the same disease. Pharmaceutical drugs may be used for a limited duration, or on a regular basis for chronic disorders. Traditionally drugs were obtained through extraction from medicinal plants, but more recently also by organic synthesis. A pharmaceutical drug, also called a medication or medicine, is a chemical substance used to treat, cure, prevent, or diagnose a disease or to promote well-being. In pharmacology, a drug is a chemical substance, typically of known structure, which, when administered to a living organism, produces a biological effect. Consumption of drugs can be via inhalation, injection, smoking, ingestion, absorption via a patch on the skin, suppository, or dissolution under the tongue. Drugs are typically distinguished from food and substances that provide nutritional support. Aspirin is a pharmaceutical drug often used to treat pain, fever, and inflammation.Ī drug is any chemical substance that causes a change in an organism's physiology or psychology when consumed. Uncoated aspirin tablets, consisting of about 90% acetylsalicylic acid, along with a minor amount of inert fillers and binders.
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