The short answer
Yes, with timing, and a routine need for extra vitamin E has not been established. The label lists vitamin E among the fat-soluble vitamins cholestyramine may keep from being absorbed, so take vitamin E at least 1 hour before or 4 to 6 hours after the resin, the label's spacing rule for other oral medicines. The measured evidence is reassuring: adding cholestyramine 12 g a day to a statin for 12 weeks left vitamin E levels unchanged, and in children treated for up to 2 years levels fell slightly but stayed normal. The label suggests considering water-miscible forms with long-term use. Keep vitamin E doses moderate, because large doses can work against vitamin K-dependent clotting and long-term cholestyramine can itself lower vitamin K.
What this answer covers
Vitamin E (alpha-tocopherol, natural or synthetic) supplements and multivitamins taken with cholestyramine resin powder for oral suspension.
- Supplement or preparation
- vitamin E
- Medication ingredient
- cholestyramine resin
What the label says
The cholestyramine label states that the resin may prevent absorption of fat-soluble vitamins such as A, D, E and K and that water-miscible or parenteral forms should be considered with long-term use. Vitamin E deficiency is not among the listed adverse reactions. The only spacing rule is for other drugs: at least 1 hour before or 4 to 6 hours after the resin, or as long an interval as possible.
What the studies measured
In 25 adults on statins, the 12 who added cholestyramine 12 g a day for 12 weeks had vitamin E levels of 11.90 mg/L before and 11.69 mg/L after, essentially unchanged and within the normal range. In 18 children treated for up to 2.5 years, vitamin E fell significantly but stayed within the normal range, and the authors judged routine supplementation unnecessary. No study comparing vitamin E supplementation during cholestyramine treatment was found.
Timing
Vitamin E, like the other fat-soluble vitamins, needs bile acids to be absorbed, and the resin binds those bile acids. Follow the label's interval for other oral medicines, vitamin E at least 1 hour before or 4 to 6 hours after cholestyramine, and take it with a meal. No vitamin E-specific interval has been studied.
Dose and a bleeding caution
Vitamin E can antagonize vitamin K-dependent clotting factors and inhibit platelets, an effect that becomes relevant at large doses, probably above 400 IU a day, and is greater when vitamin K intake is low. Cholestyramine taken long term can lower vitamin K and cause a bleeding tendency of its own, so discuss high-dose vitamin E with the prescriber, especially if you take an anticoagulant. The adult upper intake level for supplemental vitamin E is 1,000 mg daily, but this does not establish a safe dose for people at risk of bleeding. Report unusual bruising or bleeding.
Evidence and practical considerations
Absorption & effectiveness
The label lists vitamin E among fat-soluble vitamins the resin may keep from being absorbed, but measured vitamin E did not fall over 12 weeks of cholestyramine 12 g daily in adults and fell only within the normal range in children over 2 years.
- Exact scope
- Alpha-tocopherol supplements. with Cholestyramine resin powder for oral suspension (generic products, Questran and Prevalite) at any dose; the interaction happens in the gut because the resin is not absorbed.
- Medication form and route
- oral medication; oral supplement
What remains uncertain
- One small open-label adult study and one uncontrolled pediatric series; no supplementation trial; the adult study cited here lasted 12 weeks.
Factors that may matter: Duration of cholestyramine use; Underlying fat malabsorption; Age (pediatric data).
Read the supporting source summaries
Source 1: current product label
dailymed.nlm.nih.gov · Source check Sep 22, 2026
Population: People prescribed cholestyramine resin
The resin may prevent absorption of fat-soluble vitamins such as A, D, E and K; supplementation with water-miscible or parenteral forms should be considered with long-term use. Chronic use may be associated with increased bleeding tendency due to hypoprothrombinemia from vitamin K deficiency. The label tells patients to take other drugs at least 1 hour before or 4 to 6 hours after cholestyramine, or at as great an interval as possible; it gives no vitamin-specific interval.
How this applies: Exact cholestyramine resin (RxCUI 2447) as oral powder for suspension; the innovator Questran label captured in this batch carries the same folate, vitamin K, fat-soluble vitamin and spacing wording.
Vitamin E deficiency is not listed among adverse reactions; no frequency, dose or vitamin-specific interval is given.
Source 2: original human study
pubmed.ncbi.nlm.nih.gov · Source check Sep 22, 2026
Population: Twenty-five hyperlipidemic adults on statins, 12 randomized to add cholestyramine.
Vitamin E stayed within the normal range and virtually unchanged, 11.90 mg/L before and 11.69 mg/L after 12 weeks; the vitamin E to LDL-cholesterol ratio rose (p < 0.09, not significant) as LDL fell. The authors concluded cholestyramine did not lower vitamin E.
How this applies: Direct measurement showing no vitamin E fall over 12 weeks at 12 g daily; a counterpoint to assumed depletion.
Open-label, 12 people on cholestyramine, 12 weeks, moderate dose; no supplement given.
Source 3: original human study
pubmed.ncbi.nlm.nih.gov · Source check Sep 22, 2026
Population: Eighteen children with familial hypercholesterolaemia.
Mean serum vitamins A and E fell significantly over the first two years but remained within the normal range; the authors judged routine fat-soluble vitamins unnecessary and advised periodic measurement.
How this applies: Shows a measurable but sub-clinical fall in vitamin E with prolonged treatment.
Eighteen children, uncontrolled, abstract only; weight-based doses higher than typical adult use.
Research assessment: · Open full citations ↗
Timing & monitoring
Take vitamin E at least 1 hour before or 4 to 6 hours after cholestyramine, the label's general interval for oral drugs, and keep doses moderate because large vitamin E doses antagonize vitamin K-dependent clotting while long-term cholestyramine can lower vitamin K.
- Exact scope
- Alpha-tocopherol supplements; the bleeding caution applies to large doses, probably above 400 IU daily. with Cholestyramine resin powder for oral suspension (generic products, Questran and Prevalite) at any dose; the interaction happens in the gut because the resin is not absorbed.
- Medication form and route
- oral medication; oral supplement
What remains uncertain
- No vitamin E-specific interval tested; the bleeding caution combines a nutrient fact sheet statement about anticoagulants with the label's vitamin K warning, not a study of the pair.
Factors that may matter: Time between doses; Vitamin E dose; Vitamin K intake and anticoagulant use.
Read the supporting source summaries
Source 1: current product label
dailymed.nlm.nih.gov · Source check Sep 22, 2026
Population: People prescribed cholestyramine resin
The resin may prevent absorption of fat-soluble vitamins such as A, D, E and K; supplementation with water-miscible or parenteral forms should be considered with long-term use. Chronic use may be associated with increased bleeding tendency due to hypoprothrombinemia from vitamin K deficiency. The label tells patients to take other drugs at least 1 hour before or 4 to 6 hours after cholestyramine, or at as great an interval as possible; it gives no vitamin-specific interval.
How this applies: Exact cholestyramine resin (RxCUI 2447) as oral powder for suspension; the innovator Questran label captured in this batch carries the same folate, vitamin K, fat-soluble vitamin and spacing wording.
Vitamin E deficiency is not listed among adverse reactions; no frequency, dose or vitamin-specific interval is given.
Source 2: federal nutrient fact sheet
ods.od.nih.gov · Source check Sep 22, 2026
Population: General population; no cholestyramine co-use data
Alpha-tocopherol is the form that meets human needs; frank deficiency is rare but people with fat-malabsorption disorders are more likely to become deficient. The Tolerable Upper Intake Level is 1,000 mg daily for adults. Vitamin E can inhibit platelet aggregation and antagonize vitamin K-dependent clotting factors, so large doses raise bleeding risk with anticoagulants, especially with low vitamin K intake; the amount needed is unknown but probably exceeds 400 IU daily.
How this applies: Defines the supplement, its upper limit, deficiency risk with malabsorption and the vitamin K antagonism that matters alongside cholestyramine.
General nutrient guidance; the bleeding statement concerns anticoagulants, not cholestyramine.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Editorial update | |
| Source-checked release edit clarified study design, exact evidence scope and practical wording. This research edit does not constitute clinical approval. | |
| Research summary published | |
| Article prepared | |
| Prepared exact cholestyramine resin and Vitamin E article from inspected current labeling and original sources, with uncertainty stated. |
Article revision: 8dd570a64ce105db
This guide brings together the evidence records used by our interaction checker. Each finding retains its own preparation limits, research date, and source summaries.
Full citations require verification. Reading this answer and the source summaries does not.
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