Tell your doctor about all your current medicines and any you start or stop using, especially:
birth control pills or hormone replacement therapy;
digoxin (digitalis);
a diuretic or "water pill";
penicillin G;
phenobarbital;
phenylbutazone;
propranolol;
spironolactone;
tetracycline;
thyroid medication such as levothyroxine (Synthroid and others); or
warfarin (Coumadin, Jantoven).
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.
 Questran drug interactions (more detail)
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