In comparison, only 15 per cent of a control group of HIV sufferers receiving conventional treatments reached this proportion during the 48-week long study.
Dr Bonaventura Clotet of Barcelona's Hospital Universitari and his team say there is an "urgent need" for improved HIV-treating drugs due to the sizeable rates of failure in existing drug combinations.
The scientists say that over six-year periods, one in five HIV patients will be failed by their medication.
In an accompanying article, Dr Rodger MacArthur of Wayne State University in Detroit, Michigan cautioned that a further comparison between darunavir-ritonavir and tripranavir-ritonavir would be necessary to determine the true effectiveness of the new treatment.
But he added: "For now, all of us treating HIV-infected individuals in clinical practice will probably rejoice in the availability of darunavir, since it seems to be a safe, well-tolerated, and truly effective agent against multi-drug resistant HIV."
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