First of, I know of course that certain medication can cause an addiction if incorrectly used. But as far as I understand it, drugs prone to cause addiction have some agent in it, that makes them addictive.
What I am interested in is a bit different though: If a drug "helps your body" do something your body can not or only insufficiently do alone, does it get dependent on this drug, even if the drug does not have addictive substances in it?
Or in other words: Can the human body unlearn something because of the fact that medication helped it do it for some time?
Edit: To make the question a little more clear, I can give the following example: I recently received medication containing Etilefrine, which contracts my blood vessels and thus prevents me from fainting in certain situations. If I take this medication regularly for a year and the suddenly stop it, could it be possible, that my blood vessels "forgot" how to contract on their own?