A drug is any chemical substance that, when consumed, causes a change in an organism's physiology, including its psychology, if applicable
. Drugs can be classified into two main types:
- Pharmaceutical drugs : These are chemicals used to treat, cure, prevent, or diagnose a disease or to promote well-being
. They are typically obtained through extraction from medicinal plants or by organic synthesis
. Pharmaceutical drugs may be used for a limited duration or on a regular basis for chronic disorders
- Recreational drugs : These are substances that are used for the primary intention of altering the state of consciousness through alteration of the central nervous system in order to create positive emotions and feelings
. Some recreational drugs are legal, while others are illicit and subject to quality or price controls
Drugs can be consumed in various ways, such as swallowing tablets or drinking liquids, inhalation, injection, smoking, absorption via a patch on the skin, suppository, or dissolution under the tongue
. The effects of drugs on the body and brain can be both positive and negative, and they can impair a person's ability to make healthy choices and decisions
. It is essential to be aware of the potential risks and side effects associated with drug use, as some substances can cause harm to the body and brain
