For consumers and pharmacists, the only way to confirm if a medication is gluten-free is to directly contact the manufacturer, as most medications are not specifically labeled as gluten-free. Fillers added to medications can contain gluten sources like wheat, barley, and rye. To ensure medications are gluten-free, patients should remind pharmacists of their needs, ask doctors for alternative prescriptions, contact manufacturers directly, be prepared to argue with insurance companies, and periodically recheck medications' gluten-free statuses.