hip replacement infection.?

my friend had 2 failed hip replacedment surgeries, in nov. and dec. the 1st failed because a ball/socket came loose. the 2nd failed because jon got a very severe staph-type infection. he was rushed to NE Baptist Hospital (the best in our area) where the surgeon had to wait 3 days for jon's coumadin level to go down enough for surgery. then the whole hip was removed, and a cement spacer w/antibiotics placed. at first he had a vancomyacin drip, then when they sent him home, he's been taking levoflaxacin by mouth. he WAS getting better, but now the infection is all of a sudden getting worse. we are really scared. does anyone have any suggestions re: meds, intravenous, etc.? anything would help. we need to know what direction to go in, to ask his surgeon. thank you so much.