Dear rd42,
I've heard several times that depression is more common in PWP.
Sometimes I wonder whether it can be confused with what I think of as a fairly normal reaction to the progressive nature of P.D. which is sadness (just my opinion.)
Either way I know of many PWP who take anti depressants.
Perhaps someone else can give an answer to it's therapeutic value.
Cognitive behavioural therapy is another option or it can be used in conjunction with anti depressants.
Cheers,
Lee