Cholestyramine is the generic name for brands like Prevalite and Questran. It belongs to a group of drugs known as bile acid sequestrants. This medication works by reducing cholesterol in the blood of a patient. When a person has high cholesterol in their blood, they are at risk of suffering from heart disease and clogged arteries also known as atherosclerosis. Patients who are allergic to any ingredient in Cholestyramine should not use this medication.