This study is aimed to evaluate synergism effect of Cuminum cyminum L boiled extract with quadruple and triple therapy for eradication of helicobacter pillory in peptic ulcer patients. A hundred Helicobacter pylori positive peptic ulcer Patients are randomly allocated into five groups. Exclusion criteria in this study are pregnancy, upper gastrointestinal bleeding and any known history of allergic reaction to the drugs. The subjected groups included: 1- Cuminum (3g/100cc water) bid and omeprazole 20 mg bid; 2- Cuminum (3g/100cc water) b.i.d, omeprazole 20 mg bid, clarithromycin 500mg bid, amoxicillin 500mg qid; 3- Cuminum (3g/100cc water) bid and omeprazole 20 mg bid, bismuth subcitrate 120 mg qid, amoxicillin 500mg qid, metronidazole 500 mg bid; 4- omeprazole 20 mg bid, clarithromycin 500mg bid, amoxicillin 500mg qid; 5- omeprazole 20 mg bid, bismuth subcitrate 120 mg qid, amoxicillin 500mg qid, metronidazole 500 mg bid. The treatment period is two weeks. Helicobacter pylori eradication is confirmed by 13C-urea breath test 4 weeks after the end of therapy.