A randomized single-blind study was performed to compare the efficacy of cefadroxil to that of metronidazole in the treatment of bacterial vaginosis. 22 women completed the study with follow-ups after 1 and 4 weeks. After completion of treatment 2/11 women receiving metronidazole still had bacterial vaginosis compared with 1/11 women receiving cefadroxil. At follow-up after 4 weeks 3/10 women treated with cefadroxil had recurrent bacterial vaginosis while the corresponding figures for metronidazole were 2/9.