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My dad who is 73 and has had PD for 15 years has a dementia that the neuro relates to the PD. I suspected Alzheimer's for a while and it is similar. I also know he has arteriosclerosis too. His dementia is severe at times - he wanders off, is confused,and in strange settings such as the hospital he gets so disoriented and even combative. He also has a paradoxic reaction to sleeping pills, tranquilizers, narcotics, and even strong antihistimines. He gets excited, agitated, and active when given any of these. He also had severe hallucinations from his meds until he started Clozaril. He is better, but still hallucinates sometimes. I know a lot of PD patients do not have dementias, so I guess it is not universal. Does anyone know a physiological explanation of why they occur in some? Gail Post Honolulu, HI