What is cholestyramine used for (its main FDA-labeled indications)?
Cholestyramine is a bile-acid sequestrant used to treat conditions where reducing bile acids in the gut helps lower cholesterol or bind bile acids related to other diseases. Commonly cited indications include:
- Hypercholesterolemia (high LDL cholesterol), as an adjunct to diet to lower cholesterol levels [1].
- Pruritus (itching) associated with cholestatic liver diseases, such as primary biliary cholangitis and other forms of cholestasis, by binding bile acids in the intestine [2].
How does cholestyramine help lower cholesterol?
Cholestyramine binds bile acids in the intestine. With fewer bile acids reabsorbed, the liver uses more cholesterol to make new bile acids, which reduces LDL cholesterol. It is used alongside dietary changes rather than as a stand-alone therapy [1].
When is cholestyramine used for itching from bile flow problems?
For cholestatic conditions, cholestasis can increase bile acids and other substances that contribute to persistent pruritus. Cholestyramine binds bile acids in the gut, lowering their enterohepatic circulation and helping relieve itching in selected patients [2].
Are dosing and use limited by drug interactions?
Yes. Because cholestyramine can bind other medications in the GI tract, it can reduce absorption of some drugs. Clinicians typically separate cholestyramine from other oral medications by several hours to reduce interaction risk [1][2].
What alternatives are used if cholestyramine isn’t tolerated?
Depending on the indication (cholesterol vs bile-acid–related pruritus), prescribers may consider other bile-acid sequestrants or different lipid-lowering and antipruritic strategies when tolerability or interaction issues arise.
Sources
- DrugBank – Cholestyramine
- MedlinePlus – Cholestyramine