Experience of Metronidazole Triple Therapy After Clarithromycin Triple Therapy Failure for Eradication in Korea.

Bismuth quadruple therapy (BQT) is recommended as the best second-line regimen after failure of first-line clarithromycin triple therapy (CTT) for eradication. However, there are some limitations to this approach, including the lack of an appropriate sequel regimen after failure of BQT and complicated administration. Metronidazole triple therapy (MTT) is simple to administer, but it is not widely recommended. This study was conducted to determine the efficacy of MTT as second-line regimen for eradication after failure of CTT. : We retrospectively reviewed the medical records of the Korean patients with infection who underwent second-line treatment after failure of first-line CTT from October 2013 to October 2019. The efficacy of MTT and BQT for eradication was compared. : The eradication rate in the BQT group tended to be higher than that in the MTT group; however, the difference was not statistically significant (208/233, 89.3% versus 244/284, 85.9%, = 0.287). Among 40 patients with second-line MTT eradication failure, 21 received the third-line BQT, and 15 showed successful eradication (15/21, 71.4%). In the men 70 years or older, the eradication rate of MTT was lower than that of BQT without statistical significance (75.8% versus 94.1%, = 0.141). : These findings suggested that MTT could be a second-line treatment option, reserving BQT for eradication after first line CTT failure, except in elderly men 70 years or older.