Americans with disabilities aren't cared for even outside of a correctional setting. I'm sure it is even worse inside of one. I know I've read of multiple instances of people dying or suffering severe consequences because they are not in control of their medication while in custody and it is withheld from them. And that's just medication; you don't need to be disabled to need a medication.
Edit: The medication cases tend to come up in jails rather than prisons.