one of the things i learned about being the primary caregiver for
an elderly person is that unless you are lucky enough for your LO
to have a very good primary care doc, you really *do* need to
question almost everything.  

many health care personnel, unfortunately, try to do what's
expedient or what they know best, not necessarily what's in the
patient's or caregiver's best interest.  there are far too many
docs who are not up to date on geriatric care or dementias.

the last 4 years of my mother's life, she had a wonderful doctor
who not only was sensitive to my mother's needs, concerns, and
health, but did a great job of communicating with all her
children (we did ask mom to give written permission to discuss
her health with all her doctors), and was up to date on the most
appropriate treatments for my mother's problems.  

for ten years before then she had the doctor from hell, at least
for a caregiver to deal with, who essentially ran a
10-minute-appointment medicare mill.  the difference was amazing.

even with good docs, i found that i really needed to research
things, by asking pharmacists for data sheets (or checking
online), by going online and checking the rules for programs (my
mother was sometimes caught in the "can't afford it but makes too
much for financial aid" gap).