What is the Process of Drug Absorption, Distribution, Metabolism, and Excretion in the Body?

A drug is a substance that can prevent and treat diseases. In theory, a drug refers to a chemical that can affect the physiological functions of organs and cellular metabolic activities in the body, which falls within the scope of drugs, including contraceptives. Drugs only affect the speed of biological functions in the body, but cannot change existing processes or produce new functions. After being taken by the human body, drugs will exert their effects and thus achieve the purpose of preventing and treating diseases. What is the process of drugs in the body? Let's take a look at it.

The entire process of a drug from entering the body to being excreted out of the body is known as the process of drugs in the body. This process can be divided into four stages:

1. Absorption: The process of a drug entering the blood circulation through a certain pathway from the site of administration.

2. Distribution: The process of a drug being temporarily stored in body fluids and tissue fluids after absorption.

3. Metabolism: The structural changes that occur in a drug under the action of the body.

4. Excretion: After a drug exerts its effects in the body, it is either converted into a new substance or excreted out of the body in its original form, which is called excretion.

In theory, a drug refers to any chemical substance that can affect the physiological functions of organs and cellular metabolic activities in the body, which falls within the scope of drugs, including contraceptives. Drugs are used to prevent, treat, and diagnose diseases.

Drugs only affect the speed of biological functions in the body and cannot change existing natural biological processes or produce new functions. For example, drugs can accelerate or slow down biochemical reactions that cause muscle contraction, regulate the retention and excretion of water and sodium by kidney cells, regulate glandular secretion (such as mucus, gastric acid, or insulin), and affect the transmission of nerve signals. The strength of drug effects generally depends on the response of the target site.