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Cholestyramine: Uses, Dosage & Side Effects

Cholestyramine is a medication used to lower elevated cholesterol levels. It works as an ion exchange resin by binding bile acids in the intestine.

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Things worth knowing about "Cholestyramine"

Cholestyramine is a medication used to lower elevated cholesterol levels. It works as an ion exchange resin by binding bile acids in the intestine.

What is Cholestyramine?

Cholestyramine is a lipid-lowering agent belonging to the class of bile acid sequestrants (also known as anion exchange resins). It is primarily used in medicine to treat elevated LDL cholesterol levels (commonly referred to as bad cholesterol). Additionally, cholestyramine is used to manage certain forms of diarrhea and to relieve itching caused by bile acid accumulation (cholestatic pruritus).

Mechanism of Action

Cholestyramine is a non-absorbable synthetic resin that, after oral ingestion, is not absorbed into the bloodstream but acts exclusively within the intestine. It binds bile acids that would normally be recycled through the enterohepatic circulation.

By binding bile acids in the intestine, they are excreted in the stool rather than being reabsorbed into the blood.
The liver is then required to synthesize new bile acids from cholesterol at an increased rate.
This leads to enhanced uptake of LDL cholesterol from the bloodstream into liver cells via specialized receptors (LDL receptors).
The result is a measurable reduction of LDL cholesterol in the blood by an average of 15–30%.

Indications

Hypercholesterolemia

The primary indication is the treatment of primary hypercholesterolemia – elevated blood cholesterol levels – when dietary measures alone are insufficient. Cholestyramine can be used as monotherapy or in combination with other lipid-lowering agents, particularly statins.

Cholestatic Pruritus

Bile duct disorders can cause a buildup of bile acids in the blood, leading to intense itching. Cholestyramine binds excess bile acids in the intestine, which can relieve this pruritus.

Bile Acid-Induced Diarrhea

Following removal of the terminal ileum (the last section of the small intestine) or in certain bowel disorders, insufficiently absorbed bile acids can cause diarrhea. Cholestyramine can provide relief by binding these bile acids.

Dosage and Administration

Cholestyramine is typically available as a powder or granules to be dissolved in water or fruit juice before ingestion. The usual daily dose ranges from 4 to 24 g, divided into 1 to 3 doses, preferably taken with meals. The exact dosage is determined individually by the treating physician.

Important: Since cholestyramine can interfere with the absorption of other medications in the gut, other drugs should be taken at least 1 hour before or 4 to 6 hours after cholestyramine administration.

Side Effects

Since cholestyramine acts locally in the intestine and is not absorbed systemically, side effects are mainly limited to the gastrointestinal tract:

Constipation (most common side effect)
Flatulence and abdominal pain
Nausea
Heartburn
With prolonged use: possible deficiency of fat-soluble vitamins (A, D, E, K) due to impaired intestinal absorption

Drug Interactions

Cholestyramine can inhibit the absorption of numerous medications, including:

Thyroid hormones (e.g., levothyroxine)
Anticoagulants (e.g., warfarin, phenprocoumon)
Cardiac medications (e.g., digoxin)
Certain antibiotics
Fat-soluble vitamins (A, D, E, K)

Therefore, the time-staggered administration of other medications is especially important.

Contraindications

Cholestyramine should not be used in cases of:

Complete biliary obstruction (total bile duct blockage)
Known hypersensitivity to the active substance
Severe constipation

References

Summary of Product Characteristics for Cholestyramine – European Medicines Agency (EMA), current version.
Loscalzo J. et al. (eds.) – Harrison's Principles of Internal Medicine, 21st edition, McGraw-Hill Education, 2022.
Catapano AL et al. – 2016 ESC/EAS Guidelines for the Management of Dyslipidaemias. European Heart Journal, 2016; 37(39): 2999–3058.

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