Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Simethicone can decrease the absorption of thyroid medications (such as levothyroxine). If you take thyroid medication, take it at least 4 hours before or after products that contain simethicone.