Biaxin (clarithromycin) is an antibiotic related to azithromycin which
is widely used to treat STIs however
biaxin is not well studies
for STI treatment or prevention. As a result, while it is likely that biaxin may be effective against common bacterial STIs, there are not good data to say this with confidence. Most women do not have STIS and it is unlikely that your partner had and STI or if she did, you may not have acquired one.