Boston -- U.S. medical researchers say they have determined why some combination drug therapies do not work.
The Harvard Medical School study led by Professor Roy Kishony was conducted in collaboration with Stanford University research associate Selwyn Quan.
They noted combination drug therapies have become a staple for treating many infections. But, as some drugs work better together, other pairings do not.
"The question we asked was how can it be that two drugs in combination are less effective than one of them alone," Kishony said.
