<prompt> All of the following drugs are commonly used in regimens against H. pylori except -OxytetracyclineAmoxicillinBismuth subcitrateOmeprazole  <response>: Davidson;s principles and practice of medicine 22nd edition. Drugs used amoxicillin,clarithromycin,metronidazole for 7 days. Amoxicillin ,omeprazole,bismuth subcitrate and tetracycline. 