Types of drugs and their effects pdf
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Drugs are chemical substances that can change how your body and mind work. They include prescription medicines, over-the-counter medicines , alcohol , tobacco , and illegal drugs. Drug use is dangerous. It can harm your brain and body, sometimes permanently.
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Drugs are chemicals that affect the body and brain. Different drugs can have different effects. Some effects of drugs include health consequences that are long-lasting and permanent. They can even continue after a person has stopped taking the substance. There are a few ways a person can take drugs, including injection, inhalation and ingestion.
A drug is any substance that causes a change in an organism's physiology or psychology when consumed. Consumption of drugs can be via inhalation , injection , smoking , ingestion , absorption via a patch on the skin, suppository , 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. 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. Another major classification system is the Biopharmaceutics Classification System. This classifies drugs according to their solubility and permeability or absorption properties.
7 Drug Categories
Drug addiction, also called substance use disorder, is a disease that affects a person's brain and behavior and leads to an inability to control the use of a legal or illegal drug or medication. Substances such as alcohol, marijuana and nicotine also are considered drugs. When you're addicted, you may continue using the drug despite the harm it causes. Drug addiction can start with experimental use of a recreational drug in social situations, and, for some people, the drug use becomes more frequent. For others, particularly with opioids, drug addiction begins with exposure to prescribed medications, or receiving medications from a friend or relative who has been prescribed the medication. The risk of addiction and how fast you become addicted varies by drug.
Information on commonly used drugs with the potential for misuse or addiction can be found here. For drug use trends, see our Trends and Statistics page. People drink to socialize, celebrate, and relax. Why does alcohol cause people to act and feel differently? How much is too much? Why do some people become addicted while others do not? The National Institute on Alcohol Abuse and Alcoholism is researching the answers to these and many other questions about alcohol.
Drug Use and Addiction
A medication also referred to as medicine , pharmaceutical drug , medicinal drug or simply drug is a drug used to diagnose , cure , treat , or prevent disease. Drugs are classified in multiple ways. One of the key divisions is by level of control , which distinguishes prescription drugs those that a pharmacist dispenses only on the order of a physician , physician assistant , or qualified nurse from over-the-counter drugs those that consumers can order for themselves. Another key distinction is between traditional small-molecule drugs, usually derived from chemical synthesis , and biopharmaceuticals , which include recombinant proteins , vaccines , blood products used therapeutically such as IVIG , gene therapy , monoclonal antibodies and cell therapy for instance, stem-cell therapies.
Pharmacology, or the study of drugs and medications, is a complicated subject. One of the ways to make it easier to understand is to have a good knowledge of drug classification, or the system by which various drugs are grouped together.