In general, cholinesterase inhibitors have shown some benefit for patients with vascular dementia, those with mixed Alzheimer's and vascular dementia, patients with the disease known as "dementia with Lewy bodies, " and dementia from Parkinson's disease.

CNN: Better understanding of dementia leading to more effective therapies

Teresa Quinn from Lincolnshire is a full-time carer for her mother Violet, who developed Parkinson's disease and dementia following a stroke.

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Those possibilities leave open the chance she could suffer cognitive problems, mood difficulties and, over the long term, epilepsy, Parkinson's disease and dementia.

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Haloperidol (Haldol) is indicated in the treatment of behavior issues in a patient with Alzheimer's disease, but can be harmful to a patient with dementia caused by Parkinson's disease.

CNN: Better understanding of dementia leading to more effective therapies

She said that it guarantees "free personal care for around 280, 000 people suffering from conditions such as serious dementia and Parkinson's disease".

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