What other drugs affect Welchol (Colesevelam)?
Do not take your other medications at the same time you take colesevelam, unless your doctor has told you to. Colesevelam can make it harder for your body to absorb certain other medications. Tell your doctor about all other medicines you use, especially: phenytoin (Dilantin) a blood thinner such as warfarin (Coumadin) glyburide (DiaBeta, Glynase Presab, Micronase, Glucovance) thyroid hormone replacement; or birth control pills This list is not complete and other drugs may interact with colesevelam. Tell your doctor about all medications you use. This includes prescription, over-the-counter, vitamin, and herbal products. Do not start a new medication without telling your doctor.