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Bile Acid Sequestrants – Uses, Effects & Side Effects

Bile acid sequestrants are medications that bind bile acids in the intestine, preventing their reabsorption. They are primarily used to lower elevated LDL cholesterol levels.

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Things worth knowing about "Bile acid sequestrants"

Bile acid sequestrants are medications that bind bile acids in the intestine, preventing their reabsorption. They are primarily used to lower elevated LDL cholesterol levels.

What are Bile Acid Sequestrants?

Bile acid sequestrants (also called bile acid binding resins or anion exchange resins) are a class of medications that work within the gastrointestinal tract without being absorbed into the bloodstream. They bind bile acids in the intestinal lumen, preventing them from being returned to the liver via the enterohepatic circulation. This forces the liver to produce more bile acids from cholesterol, which in turn lowers blood cholesterol levels.

Mechanism of Action

Bile acids are normally synthesized from cholesterol in the liver, secreted into the small intestine, and then reabsorbed mainly in the terminal ileum (the final section of the small intestine). This process is known as the enterohepatic circulation.

Bile acid sequestrants are large, positively charged polymers that tightly bind negatively charged bile acids in the intestine.
The bound bile acids are excreted with the stool and are no longer available to the body.
The liver compensates for this loss by converting cholesterol into new bile acids.
As a result, LDL cholesterol levels in the blood typically decrease by 15–30%.

Indications

Bile acid sequestrants are used for:

Hypercholesterolemia (elevated LDL cholesterol), especially when statins are not tolerated or as an add-on to statin therapy
Familial hypercholesterolemia (genetically caused markedly elevated cholesterol levels)
Bile acid-induced diarrhea (diarrhea caused by excess bile acids in the colon, for example after ileal resection)
Cholestasis-related pruritus (skin itching due to bile acid accumulation in liver disease)

Active Substances and Preparations

Well-known bile acid sequestrants include:

Cholestyramine (Colestyramine) – one of the oldest and most commonly used preparations, available as a powder to be mixed into liquid
Colestipol – similar action to cholestyramine, available as granules or tablets
Colesevelam – a newer agent with improved tolerability and fewer drug interactions, available as a tablet

Dosage and Administration

Dosage depends on the specific active substance and indication. Cholestyramine is typically administered at a daily dose of 4–24 g, divided into several portions. Colesevelam is typically dosed at 3.75 g per day. Bile acid sequestrants should always be taken with meals, as bile acids are released most actively into the intestine after eating.

Side Effects

Because bile acid sequestrants are not absorbed into the bloodstream, systemic side effects are rare. The most common side effects are gastrointestinal:

Bloating and flatulence
Constipation, especially at higher doses
Nausea and stomach discomfort
Rarely: abdominal pain or diarrhea

With long-term use, the absorption of fat-soluble vitamins (A, D, E, K) and certain medications may be impaired.

Drug Interactions

Bile acid sequestrants can reduce the absorption of many medications, as they non-specifically bind substances in the intestine. These include:

Thyroid hormones (e.g., levothyroxine)
Cardiac glycosides (e.g., digoxin)
Anticoagulants (e.g., warfarin / phenprocoumon)
Certain antibiotics and diuretics

As a general rule, other medications should be taken at least 1 hour before or 4–6 hours after taking a bile acid sequestrant.

Contraindications

Complete biliary obstruction (as no bile acids are present in the intestine)
Severe intestinal motility disorders
Hypersensitivity to the respective active substance

References

Catapano AL et al. – 2016 ESC/EAS Guidelines for the Management of Dyslipidaemias. European Heart Journal. 2016;37(39):2999–3058.
Libby P. et al. – Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 12th Edition, Elsevier, 2021.
Bays HE et al. – Colesevelam hydrochloride therapy in patients with type 2 diabetes mellitus treated with metformin. Archives of Internal Medicine. 2008;168(18):1975–1983.

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