How Vitamin A interacts with Bile acid sequestrants

Interaction type: Interactions

Interaction rating: Proven

These medications decrease the absorption of fat-soluble nutrients such as vitamin A. Supplementation with the affected nutrient(s) may be necessary. (1) (2)

These drugs include cholestyramine, colestipol, colesevelam


  1. Longenecker JB, Basu SG. Effect of Cholestyramine on Absorption of Amino Acids and Vitamin A in Man. Fed Proc. 1965;24:375.
  2. View Abstract: Schwarz KB, et al. Fat-soluble Vitamin Concentrations in Hypercholesterolemic Children Treated with Colestipol. Pediatrics. Feb1980;65(2):243-50.