If you are concerned about your medication (prescription OR non-prescription) containing Chametz, you can now use the handy-dandy searchable database that is available on Clalit's website (it's open to all, you don't need to be signed in to use it). It lists the medications that they have determined are acceptable for use on Pesach.
You have a choice of searching by the first letter of the medication's name in English OR Hebrew.
This list is probably only valid for the formulations that are sold here in Israel.
I'm not going to get into the halachic questions that may arise from this, please ask your Rav if you have questions about medications you take! Thanks for understanding.