What are the causes of itchy scalp?  Is there any literature or
research indicating that ropinirole (Requip) tablets or Selegiline
tablets can cause itchy scalp?  Besides all the medicated shampoos on
the drugstore shelves, are there other ways to prevent itchy scalp? 
Prescription shampoos for instance? I  know there are products to
relieve the itch after it begins, but how can people avoid it
happening in the first place?   If it makes a difference, these
questions are about a white male in his sixties who does not have
dandruff.