Parkinson's Disease with Dementia: What Treatment Is Recommended?

This protocol covers the management of Parkinson's disease in patients who have developed dementia (PDD — Parkinson's disease dementia). Cognitive disorders in PD span a defined spectrum, and the PDD sub-population requires a specific, evidence-based approach distinct from earlier cognitive stages.

Parkinson's disease with concurrent dementia. Cognitive disorders in PD patients are classified as PD with mild cognitive impairment (PD-MCI) or PD with dementia (PDD) according to international definition criteria. This protocol applies specifically to the PDD sub-population.

Management in this setting combines non-pharmacological cognitive stimulation with pharmacological therapy. Within the relevant drug class, specific agents are indicated for PDD — while at least one agent in that class is not appropriate and should be avoided.

The complete regimen — including agent selection, sequencing, and considerations for individual agents — is available in the full structured protocol below.