Table 7. The efficacy of second line therapies for H. pylori eradication .

Year	City	First Regimen	Second Regimen	Number of Patients	Per-protocol Eradication Rate
2001	Tehran73	OABM	OTBF	80	90
2003	Tehran74	OABM	OABF	90	78.7
2010	Isfahan75	OABM	OABC OAzBOf	110 110	74.7 86.7
2012	Sari37	Sequential	OABF (F: 7days)	36	82.9
2015	Rasht52	OABM	OBTMOf OABCT	104 104	86.7 76
2016	Sari77	OABM OABF	OABC OABC	32 31	87 82.7
2016	Sari79	Non-bismuth clarithromycin-containing	PAL	61	91.8

O: Omeprazole, Amox: Amoxicillin, B: Bismuth subcitrate, Tetra: Tetracycline, M: Metronidazole, C: Clarithromycin, F: Furazolidone, Of: Ofloxacin, Az: Azithromycin