Final answer:
The fibric acid agents used to decrease blood cholesterol levels are Lopid (gemfibrozil) and Colestid (colestipol).
Step-by-step explanation:
The fibric acid agents that can be used to decrease blood cholesterol levels are:
- Lopid (gemfibrozil)
- Colestid (colestipol)
Both Lopid and Colestid are fibric acid derivatives that work by reducing the production and increasing the breakdown of cholesterol in the body. They are commonly prescribed to lower triglyceride levels and increase high-density lipoprotein (HDL) cholesterol levels. The other medications listed, Atromid-S, Zetia, and Zocor, do not belong to the fibric acid agent class.