Drug-Related Side Effects and Adverse ReactionsAmoxicillinAmoxicillin-Potassium Clavulanate CombinationAnti-Bacterial AgentsPenicillinsClavulanic AcidClarithromycinClavulanic AcidsMetronidazoleDrug Therapy, CombinationHelicobacter pyloriMicrobial Sensitivity TestsHelicobacter InfectionsOmeprazole2-PyridinylmethylsulfinylbenzimidazolesAmpicillin