An antibiotic appears to be a safe treatment for stroke and a good companion therapy for tPA, the clot buster that is currently the only FDA-approved drug therapy, researchers report. A safety study in 60 stroke patients in Georgia, Kentucky and Oregon found the drug well tolerated even at three-and-one-half times the dose currently used for conditions such as rheumatoid arthritis, according to a research team led by the Medical College of Georgia and the University of Georgia.