Adelle, I'm sure your husband's doc has his reasons, since some people should NOT take it due to other conditioins, like being over 60, which I am. I'm pretty sure, however, that it's okay--AFTER CHECKING WITH OUR OWN DOCTORS--for many with PD, because it's listed in the rxlist.com monograph as being useful in some cases of PD, and especially because my neuropsychiatrist, neurologist, and internist all know I take it on an OCCASIONAL basis and approve of it for sleep. My neuropsychiatrist does like me to avoid drugs with anticholinergic effects because of their possible negative effects on memory.
Everyone remember, my experience is applicable to me. We are not doctors. We can read pretty good, but we're not doctors.
Jaye