According to the FDA, the majority of oral drugs contain no gluten or “virtually” no gluten. However, you need to check labels and inserts carefully to be sure. For non-prescription drugs, check the ingredients on the “Drug Facts” label in the “inactive ingredients” section. For prescription drugs, check ingredients listed in the “Description” section of the label. Among the ingredients to check for are wheat, starches, dextrates, dextrin, dextrimaltose, and caramel coloring.