Parexel and TeGenero have so far kept silent on the drug trial
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The lawyer representing some of the men who fell seriously ill during a drug trial has criticised the response he has had from the companies involved.
Martin Day said he has made many efforts to get information about the tests at Northwick Park Hospital in Harrow, north-west London, last month.
But he said Parexel, which conducted the tests, and TeGenero, which developed the drug, had not replied.
Mr Day is acting for four of the six men who took part in the trial.
He said if the companies continued to ignore him, he would go through the courts to force them to open up.
Health prospects
He said all of his clients were now out of hospital and they were "doing much better".
Two men remain in hospital. One is in intensive care but is fully conscious.
"These guys have faced a terrible ordeal and the most significant thing for them is what their future is," he told BBC Five Live.
"So we were keen to get as much information as we could."
Mr Day, of Leigh Day Solicitors, said he has written nine times over the last few days to German company TeGenero and medical research company Parexel.
"Despite that, one of them has point blank refused to meet with us and the other has simply avoided responding," he said.
Although his clients have been told they would receive compensation, Mr Day said information about their long-term health prospects was more important.