Antilipidemic drugs that prevent hypercho- lesterolemia by inhibiting absorption :
**Core Concept**
Antilipidemic drugs that prevent hypercholesterolemia by inhibiting absorption belong to a class of medications that target the gastrointestinal tract to reduce cholesterol intake. These drugs work by either binding to bile acids in the intestine or inhibiting the absorption of dietary cholesterol.
**Why the Correct Answer is Right**
Bile acid sequestrants, such as cholestyramine, colestipol, and colesevelam, are antilipidemic drugs that work by binding to bile acids in the intestine, thereby reducing the amount of cholesterol available for absorption. This leads to an increase in the conversion of cholesterol to bile acids in the liver, resulting in a decrease in circulating cholesterol levels. In contrast, cholesterol absorption inhibitors, such as ezetimibe, work by inhibiting the absorption of dietary cholesterol in the small intestine.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not a correct antilipidemic drug that prevents hypercholesterolemia by inhibiting absorption.
**Option B:** This option is not a correct antilipidemic drug that prevents hypercholesterolemia by inhibiting absorption.
**Option D:** This option is not a correct antilipidemic drug that prevents hypercholesterolemia by inhibiting absorption.
**Clinical Pearl / High-Yield Fact**
Bile acid sequestrants can interfere with the absorption of fat-soluble vitamins, including vitamin D, and may require supplementation in patients on long-term therapy.
**Correct Answer: C. Ezetimibe**