Possible link between Parkinson's medication and schizophrenia-like symptoms?

Hello all,
A relative of mine was diagnosed with Parkinson's a year back. We first put her on some medication (don't know the name), but it was too strong and ended up causing hallucinations and delusions. Parkinson's medication is made up of dopamine precursors, as I understand it. I also believe that schizophrenia is linked to an excess of dopamine. Could very strong Parkinson's medications thus induce schizophrenia-like symptoms in a patient?