Health experts are calling for the more research for the development of alternative and safer treatment for dementia patients after studies suggested that the anti-psychotic drugs used to treat patients might be increasing risks.

Such drugs are generally used as sedative when the patients become aggressive or distressed. Health experts have said that prescribing certain types of anti-psychotics might be increasing the risks.

The appeals come after television presenter Fiona Phillips claimed that drugs prescribed to her father, Neville for treatment of Alzheimer's during the years contributed to his death. The disease took away her mother Amy and then her father earlier this month. She said that the powerful drug used in the psychiatric hospital where her father was receiving treatment, contributed to his death.

On a visit to her father in December, she had found that he is being given two addictive sedatives that could cause cognitive decline. The anti-psychotic drug is known to increase risk of death in those with dementia. Despite her plea to withdraw the medication, her father's condition continued to deteriorate.

"I am so angry at the way my lovely, lovely dad was treated at the end. In his final weeks he was so coshed by drugs that his poor body couldn't cope," she said.

Her beliefs were proven by a study by scientists at Harvard Medical School, which found certain anti-psychotic drugs increased the risk of death in elderly nursing home patients.