This is kind of nifty. There's gluten found in a lot of medicines that you wouldn't even think about - both prescription and over-the-counter stuff. In fact, if you look at the ingredients list on your pill bottles, watch out for starches. If it doesn't say that it's made from tapioca or corn or some other grain, it may well be a wheat by-product. Also, a lot of the dextrose ingredients can be made from barley or wheat. As of now, the FDA doesn't require pharmaceutical companies to label their products as containing gluten.
Hopefully, that's about to change.
House members Tim Ryan and Nita Lowey have introduced the Gluten in Medication Identification Act of 2012 (HR 4972) which "requires that the label of drugs intended for human use contain a
parenthetical statement identifying the source of any ingredient
constituting or derived from a grain or starch-containing ingredient." The bill is supported by the Celiac Sprue Association, Gluten Intolerance Group, American Celiac
Disease Alliance, National Foundation for Celiac Awareness, and Celiac