Dual Therapy in Duodenal Ulcer Disease In Well controlled, double-blind studies, H. pylori infected duodenal ulcer patients received eradication therapy with clarithromycin 500 mg TID and omeprazole 40 mg daily for 14 days followed by omeprazole 40 mg (study A) or omeprazole 20 mg (studies B, C and D) daily for an additional 14 days;每个对照组的患者仅接受奥美拉唑单独接受28天。在研究A中,幽门螺杆菌在接受克拉霉素和奥美拉唑的80%的患者中被消除,仅1%的患者仅接受奥美拉唑。在研究B,C和D中,接受克拉霉素和奥美拉唑的患者的合并根除率超过70%,仅接受奥美拉唑的患者少于1%。在每项研究中,与单独接受奥美拉唑的患者相比,克拉霉素和奥美拉唑治疗的患者在6个月的溃疡复发率在统计学上较低。