Family of a man who died after suffering an allergic reaction to anti-psychotic drugs are looking to sue the hospital responsible.

Dad-of-two Kirpal Rahel, died at Hillingdon Hospital in Uxbridge, three says after being sectioned under the mental health act.

At the inquest into the 42-year-old's death yesterday (thurs) the court heard that Mr Rahel, who had Bi Polar disease, suffered fatal heart failure as a result of being given the anti-psychotic drug commonly known  as Accuphase, on July 21, 2005.

Speaking following the inquest, his sister Nina Rahel, said: "Whatever happened in that court room didn't give us what we wanted, which is for my brother not to have died five-years-ago.

"What we heard was heart breaking. He needn't have died if the correct procedures were in place. He shouldn't have been given that drug and he should be alive today. The hospital have taken no responsibility, we have asked our lawyer to look into taking further action upon them."

Kirpal Rahel, who grew up in College Road, Isleworth, where his parents still live, was a Syon School pupil before attending Cambridge University and eventually became a military history lecturer at Richmond College and Hampton Palace.

Hilingdon Hospital has come under fire from the family after a number of avoidable "blunders".

Mr Rahel was sectioned under the Mental Health Act on July 21, 2005 and taken to the Crane Ward, where he was given the strong anti-psychotic drug Zuclopenthixol, despite it having a dangerous reaction with the drug he was already on Olanzapine.

Despite the doctor's orders that he should only be given the drug if he became unmanageable, there was no evidence at the inquest that his behaviour was anything but calm.

Expert evidence at the inquest revealed that Mr Rahel would have died from the combination of drugs around the same time that a check was done on him by an hospital employee simply shining a torch through the window – despite doctors orders that his vital signs should be monitored throughout the night.

Bobby Walia, Solicitor on behalf of the family said: "It is disappointing that no answers were given as to why Kirpal was administered a maximum dose of , a drug which was to be given only if his behaviour became unmanageable.

"No evidence was heard that Kirpals behaviour had in any way become unmanageable. In fact there was sufficient evidence that if anything his behaviour was quite placid.

"The inquest also highlighted concerns over the monitoring and recording of Kirpals condition after he was given this drug. Something which the family always believed was unsatisfactory.”

Clare Murdoch, chief executive of Central and North West London Mental Health Trust, who now manage the mental health unit, said: " We are continuing to work with the Trust, which was responsible for the service at the time, to ensure that we, with their help, are able to address any unanswered issues to ensure that all possible lessons are learned and shared for the benefit of future patients and their families.

"Yesterday's inquest verdict will obviously be of enormous help in informing our next steps and we will keep Mr Rahel's family closely informed of our progress."