Dementia Drugs Market Size, Share & Industry Analysis, By Drug Class (Cholinesterase Inhibitors, NMDA Receptor Antagonists, and Amyloid Beta-directed Antibodies), By Indication (Alzheimer's Disease and Parkinson's Disease Dementia), By Type (Branded and Generics), By Route of Administration (Oral, Parenteral, and Others), By Treatment Type (Symptomatic Cognitive Therapies, Disease-modifying Therapies, and Behavioral & Neuropsychiatric Symptom Therapies), By Distribution Channel (Hospital Pharmacies, Retail Pharmacies & Drug Stores, and Online Pharmacies), and Regional Forecast, 2026-2034