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Colesevelam – Uses, Dosage & Side Effects

Colesevelam is a prescription medication used to lower elevated LDL cholesterol levels and to improve blood sugar control in type 2 diabetes. It belongs to the class of bile acid sequestrants.

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Things worth knowing about "Colesevelam"

Colesevelam is a prescription medication used to lower elevated LDL cholesterol levels and to improve blood sugar control in type 2 diabetes. It belongs to the class of bile acid sequestrants.

What is Colesevelam?

Colesevelam is a polymeric bile acid sequestrant, a type of ion-exchange resin that binds bile acids in the digestive tract. It is a prescription drug approved for the treatment of elevated LDL cholesterol (primary hypercholesterolemia) and for improving blood glucose control in adults with type 2 diabetes mellitus. Unlike many other medications, colesevelam is not absorbed into the bloodstream and works entirely within the gastrointestinal tract.

Indications

Colesevelam is used in the following clinical settings:

Primary hypercholesterolemia: To reduce LDL cholesterol levels, either alone or in combination with a statin.
Type 2 diabetes mellitus: As an adjunct to diet, exercise, and other antidiabetic agents to improve glycemic control.
Cholestatic pruritus: In some countries, it is used to relieve itching caused by bile salt deposits in the skin.

Mechanism of Action

Colesevelam binds to bile acids in the small intestine, preventing their reabsorption into the bloodstream. This interrupts the enterohepatic circulation of bile acids, forcing the liver to convert more cholesterol into new bile acids. As a result, the liver increases its uptake of LDL cholesterol from the blood, leading to lower LDL levels.

The glucose-lowering mechanism is less fully understood. Research suggests that colesevelam may alter the gut environment in a way that stimulates the release of incretin hormones such as GLP-1 (glucagon-like peptide-1), which in turn enhances insulin secretion and suppresses hepatic glucose production.

Dosage and Administration

Colesevelam is available as film-coated tablets and as a powder for oral suspension. The standard daily dose is 3.75 g per day, taken either as a single daily dose or divided into two doses. It should be taken with meals and plenty of water to maximize effectiveness and reduce gastrointestinal side effects.

Important Administration Notes

Other oral medications should be taken at least 4 hours before colesevelam to prevent drug interaction.
For patients with difficulty swallowing, the powder suspension form is recommended.
Taking the medication without food or sufficient fluid may increase the risk of constipation.

Side Effects

Because colesevelam is not absorbed systemically, most side effects are limited to the gastrointestinal tract:

Constipation – the most commonly reported side effect
Flatulence and bloating
Nausea and stomach discomfort
Elevated triglyceride levels (especially in patients with pre-existing hypertriglyceridemia)
Rarely: dysphagia (difficulty swallowing) when taking the tablet form

Contraindications and Precautions

Colesevelam should not be used in patients with:

Known hypersensitivity to the active substance
Hypertriglyceridemia with triglyceride levels above 500 mg/dL
Complete bile duct obstruction
A history of bowel obstruction (ileus)

Caution is advised in patients with swallowing disorders or delayed gastric emptying. Pregnant or breastfeeding women should consult a physician before use, as colesevelam may reduce the absorption of fat-soluble vitamins (A, D, E, K) and folate.

Drug Interactions

Colesevelam can reduce the absorption of several medications. Clinically relevant interactions include:

Thyroid hormones (e.g., levothyroxine)
Oral contraceptives
Fat-soluble vitamins (A, D, E, K)
Cyclosporine and other immunosuppressants
Glyburide (an oral antidiabetic agent)

To minimize interactions, all other oral medications should be taken at least 4 hours before colesevelam.

References

European Medicines Agency (EMA): Summary of Product Characteristics for Colesevelam. www.ema.europa.eu
Bays HE, Goldberg RB – The forgotten bile acid sequestrants: is now a good time to remember? American Journal of Therapeutics, 2007.
Handelsman Y et al. – American Association of Clinical Endocrinologists and American College of Endocrinology Guidelines for Management of Dyslipidemia. Endocrine Practice, 2017.

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