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Generic name: cholestyraminekoe-le-STYE-ra-meen ]
Brand names: Prevalite, Prevalite Packets, Questran, Questran Light, Questran Packets, Cholestyramine Light
Drug class: Bile acid sequestrants

Medically reviewed by on Aug 3, 2023. Written by Cerner Multum.

What is Questran?

Questran is used to lower high levels of cholesterol in the blood, especially low-density lipoprotein (LDL) ("bad" cholesterol).

Questran is also used to treat itching caused by a blockage in the bile ducts of the gallbladder.

Questran may also be used for purposes not listed in this medication guide.

Questran side effects

Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Questran may cause serious side effects. Call your doctor at once if you have:

Side effects such as constipation may be more likely in older adults.

Common side effects of Questran may include:

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


You should not use Questran if you have a blockage in your stomach or intestines.

Before taking this medicine

You should not use Questran if you are allergic to it, or if you have:

Tell your doctor if you have ever had:

This medicine may contain phenylalanine. Talk to your doctor before using Questran if you have phenylketonuria (PKU).

Taking Questran can make it harder for your body to absorb certain vitamins. Your doctor may recommend you take a vitamin supplement.

Tell your doctor if you are pregnant or breastfeeding.

You may have an even greater need for vitamin supplements during pregnancy or while you are breast-feeding a baby. Follow your doctor's instructions about taking vitamin supplements during treatment with Questran.

How should I take Questran?

Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.

Although Questran is usually taken once or twice per day, Questran may be taken up to 6 times per day. Carefully follow your doctor's dosing instructions.

Mix the Questran powder with at least 2 to 6 ounces of water or other non-carbonated beverage. You may also mix the powder with a brothy soup, crushed pineapple, or applesauce. Measure the powder using the scoop provided with your medication. Do not use any other scoop or measuring cup to measure your this medicine dose.

Use Questran regularly to get the most benefit. Get your prescription refilled before you run out of medicine completely.

Questran can affect the surfaces of your teeth. Sipping the this medicine/liquid mixture slowly or holding the liquid in your mouth for too long may result in tooth discoloration, enamel erosion, or tooth decay. Be sure to brush your teeth regularly while you are using this medicine.

Drink extra fluids to prevent constipation while you are taking Questran.

While using Questran, you may need frequent blood tests.

Questran is only part of a complete program of treatment that may also include diet, exercise, and weight control. Follow your diet, medication, and exercise routines very closely.

Store at room temperature away from moisture and heat.

What happens if I miss a dose?

Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

Overdose symptoms may include severe stomach pain or constipation.

What should I avoid while taking Questran?

Avoid taking other medications at the same time you take Questran. Wait at least 1 hour before or 4 to 6 hours after taking this medicine before you take any other medications.

What other drugs will affect Questran?

Tell your doctor about all your current medicines. Many drugs can affect Questran, especially:

This list is not complete. Other drugs may interact with cholestyramine, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide.

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.