Clarithromycin is not usually used to treat UTIs, because clarithromycin is mainly metabolized by the liver, and is less likely to be excreted from the body through the urinary tract, so the concentration in the urinary tract is not as high as it should be, and it does not have a local anti-infective effect. Clarithromycin can be used in the treatment of some respiratory tract infections, or the treatment of Helicobacter pylori infection, in addition to soft tissue skin infections can also be treated with clarithromycin. Clarithromycin is a macrolide antibiotic, urethritis if you want to be treated, preferred cephalosporins or quinolones, if you want to use macrolide antibiotics to treat urethritis can choose azithromycin. Azithromycin for chlamydia, mycoplasma infection of urethritis treatment effect is better, so clarithromycin usually will not be used to treat urethritis, it treatment of urethritis effect is not good.