ABSTRACTDementia is one of the most common disorders among elderly patients, Worldwide 7.7 million new cases of dementia were anticipated each year, implying one new case every 4.1 seconds. The aim of the study is to assess the psychiatric co morbidity and prescribing pattern in a tertiary care hospital in south India. This was an Prospective Observational Study conducted at tertiary care hospital. Prospective data was collected from outpatient and inpatient department. Out of 16 patients the common type of dementia reported was Alzheimer’s disease found in ,56.3% of the cases followed by vascular dementia and the prescribed drugs were Memantine (37.5%) is the prescribed drug for most of the dementia cases followed by donepezil (25%), Memantine + donepezil combination (18.75%), Rivastigmine (12.5%), Memantine + Rivastigmine combination  (6.2%). The common type of dementia reported was Alzheimers and Memantine was the most commonly prescribed drug in mono-therapy and among combination therapy Memantine–donepezil combination was mostly prescribed. Keywords: dementia, prescribing pattern, psychiatric co morbidity