Is cholestyramine available as tablets?

Cholestyramine Formulation Availability

No, cholestyramine is NOT available in pill or tablet form—it is only available as a powder for oral suspension that must be mixed with liquid before ingestion. 1, 2

Key Formulation Details

Cholestyramine Formulations

• Only available as: Powder for oral suspension
• Must be mixed with: At least 2-3 ounces of water or other non-carbonated beverages 2
• Cannot be taken: In dry form—always requires mixing with fluids 2
• Dosing: 8-16 g/day orally, divided into 2 doses 1

Alternative Bile Acid Sequestrant with Tablet Form

If tablet formulation is clinically important, colesevelam is available as tablets and represents a practical alternative within the same drug class 1:

• Colesevelam tablets: 6 tablets orally once daily OR 3 tablets orally twice daily
• Also available as suspension: 3.75-g packet (equivalent to 6 tablets) or 1.875-g packet (equivalent to 3 tablets)
• Take with: Meal and liquid 1

Clinical Implications

Acceptability and Compliance Considerations

The powder formulation of cholestyramine presents significant adherence challenges:

• Pill burden and inconvenience of powder preparation are major prescribing considerations 1
• In pediatric studies, 82% of patients preferred pill form over powder, with compliance significantly greater for pills (61%) versus powder (50%, p=0.01) 3
• Changing from powder to pill formulation increased compliance by at least 25% in 42% of patients 3

Practical Prescribing Guidance

When cholestyramine powder is necessary:

• Start with gradual dose titration (1 pouch/scoop once daily for 5-7 days) to minimize constipation 2
• Mix powder with at least 2-6 ounces of fluid; can also use highly fluid soups or pulpy fruits like applesauce 2
• Warning: Sipping or holding suspension in mouth for prolonged periods may cause tooth discoloration, enamel erosion, or decay 2

When tablet formulation is preferred:

• Consider colesevelam as second-line therapy 4
• Colesevelam has favorable benefit:risk profile with easier administration compared to cholestyramine powder 4
• Similar efficacy: Colesevelam 15% LDL-C reduction vs cholestyramine 10.4% reduction 1

Important Drug Interactions

All bile acid sequestrants (powder or tablet) require medication timing adjustments:

• Other medications should be taken at least 1 hour before or 4-6 hours after bile acid sequestrants 1, 2
• Particularly important for: warfarin, thyroid hormones, oral contraceptives, phenytoin, and fat-soluble vitamins 1