All patients were assigned to 14 days treatment with ranitidine 300 mg b.i.d and clarithromycin 750 mg b.i.d. Group A ( n = 53 ) also received a placebo twice daily , while group B ( n = 52 ) received lymecycline 300 mg b.i.d. Treatment with ranitidine , 150 mg b.i.d , was continued for an additional 30 days .
