Let's say you are a choleh who is permitted or required to take a chometz-containing medication during Pesach (according to the halachos described here: http://www.star-k.org/kashrus/kk-passover-medicine.htm ). Let's imagine, furthermore, that yours is a medication that is somehow based on chometz in terms of its function or ability to heal.
My question is this: When you make the nullification on your chometz before Pesach starts, is the chometz of your medication understood as being "nullified" in an absolute sense, too--whereby, mystically speaking, your medicine should not work for you?
(I understand this is a case of abstractions upon abstractions -- but I still wonder if there is a source that deals with this. Otherwise it would seem that the nullification process could be confusing, even scary, for those hypothetically in this situation. I am looking for a textual source for the exact sense and extent of bitul in light of these hypothetical concerns.)