Bile Acid Sequestrants

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Also indexed as:

Cholestyramine, Prevalite, Questran

Cholestyramine (Questran®) and colestipol (Colestid®) are bile acid sequestrants-a class of drugs that binds bile acids, prevents their reabsorption from the digestive system, and reduces cholesterol levels. Cholestyramine and colestipol are two of many drugs used to lower cholesterol levels in people with high cholesterol.

Bile acids are produced in the liver from cholesterol and secreted into the small intestine to help with the absorption of dietary fat and cholesterol. Bile acid sequestrants bind bile acids in the small intestine and carry them out of the body. This causes the body to use more cholesterol to make more bile acids, which are secreted into the small intestine, bound to bile acid sequestrants, and carried out of the body. The end result is lower cholesterol levels. Bile acid sequestrants also prevent absorption of some dietary cholesterol.

The information in this article pertains to bile acid sequestrants in general. The interactions reported here may not apply to all the Also Indexed As terms. Talk to your doctor or pharmacist if you are taking any of these drugs.

Herbs

Summary of Interactions for Bile Acid Sequestrants

Depletion or interference	Beta-carotene and other carotenoids Calcium* Folic acid Vitamin A Vitamin D Vitamin E Vitamin K Zinc*
Adverse interaction	None known
Side effect reduction/prevention	None known
Supportive interaction	None known
Reduced drug absorption/bioavailability	None known

An asterisk (*) next to an item in the summary indicates that the interaction is supported only by weak, fragmentary, and/or contradictory scientific evidence.

Interactions with Supplements

Vitamins and Minerals

Bile acid sequestrants may prevent absorption of folic acid and the fat-soluble vitamins A, D, E, and K.^{1, 2} Other medications and vitamin supplements should be taken one hour before or four to six hours after bile acid sequestrants for optimal absorption.³ Animal studies suggest calcium and zinc may also be depleted by taking cholestyramine.⁴

Carotenoids

Use of colestipol for six months has been shown to significantly lower blood levels of carotenoids including beta-carotene.⁵

Other Interactions

Food

Bile acid sequestrants should be taken with plenty of water before meals.⁶

References

1. Werbach MR. Foundations of Nutritional Medicine. Tarzana, CA: Third Line Press, 1997, 221-2 [review].
2. Threlkeld DS, ed. Diuretics and Cardiovasculars, Antihyperlipidemic Agents, Bile Acid Sequestrants. In Facts and Comparisons Drug Information. St. Louis, MO: Facts and Comparisons, Feb 1997, 171i-l.
3. Threlkeld DS, ed. Diuretics and Cardiovasculars, Antihyperlipidemic Agents, Bile Acid Sequestrants. In Facts and Comparisons Drug Information. St. Louis, MO: Facts and Comparisons, Feb 1997, 171i-l.
4. Watkins DW, Cassidy MM, Khalafi R, Vahouny GV. Calcium and zinc balances in rats chronically fed the bile salt-sequestrant cholestyramine (Questran). Fed Proc 1983;42:819.
5. Probstfield JL, Lin T, Peters J, Hunninghake DB. Carotenoids and vitamin A: The effect of hypocholesterolemic agents on serum levels. Metabolism 1985;34:88-91.
6. Threlkeld DS, ed. Diuretics and Cardiovasculars, Antihyperlipidemic Agents, Bile Acid Sequestrants. In Facts and Comparisons Drug Information. St. Louis, MO: Facts and Comparisons, Feb 1997, 171i-l.

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Last Review: 09-01-2007

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