In some animal studies, cholestyramine was found to cause tumors. It is not known whether cholestyramine causes tumors in humans.
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
Rare
Black, tarry stools
stomach pain (severe) with nausea and vomiting
Check with your doctor as soon as possible if any of the following side effects occur:
More common
Constipation
Rare
Loss of weight (sudden)
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
More common
Heartburn or indigestion
nausea or vomiting
stomach pain
Less common
Belching
bloating
diarrhea
dizziness
headache
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
 Questran Light side effects (more detail)
