After the absorption and distribution of drugs in the body, the end products are excreted by different ways, mainly through the following ways: 1, excretion by the kidney, the kidney is an important organ for drug excretion, so generally most drugs are excreted through the kidney. 2, biliary excretion, many drugs are excreted in the bile by the liver, and then excreted in the feces by the bile flowing into the intestinal cavity. 3, hepatic excretion, some drugs in the intestinal cavity and The drug can be reabsorbed in the intestinal cavity, forming a hepatic-intestinal cycle, such as digitalis toxicity glucoside in the body can be hepatic-intestinal cycle, making the drug last longer. 4, mammary gland excretion, breast milk is acidic some weak alkaline drugs, such as morphine, atropine, etc., easy to excrete from the breast milk, so lactating women should be careful with the drug, so as not to cause adverse reactions to the breast. 5, respiratory excretion, volatile drugs can also be excreted from the respiratory tract through the lungs.