Welchol can make it harder for your body to absorb other medicines you take, which could make those medicines less effective. If you take any of the following medicines, take them 4 hours before you take this medicine:
cyclosporine;
olmesartan;
phenytoin;
levothyroxine or other thyroid medication;
birth control pills;
multivitamins;
warfarin (Coumadin, Jantoven); or
oral diabetes medication--chlorpropamide, glimepiride, glipizide, or glyburide, tolazamide, tolbutamide.
This list is not complete and many other drugs may affect Welchol. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.
 Welchol drug interactions (more detail)
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