Clavulanic AcidAmoxicillinAmoxicillin-Potassium Clavulanate CombinationSulbactamPenicillanic AcidAnti-Bacterial Agentsbeta-LactamasesPiperacillinbeta-LactamsClavulanic AcidsPenicillinsMethemoglobinemiaPotassiumMicrobial Sensitivity TestsAmpicillinTicarcillinbeta-Lactam ResistanceDrug Therapy, CombinationKlebsiella pneumoniaeKlebsiella InfectionsMethylene BlueCephalosporinsEnterobacteriaceaeClarithromycinPotassium ChannelsMetronidazoleOtitis MediaToxicity TestsHelicobacter pyloriDrug Resistance, BacterialPenicillin ResistanceStreptococcus pneumoniaeEnzyme InhibitorsHelicobacter InfectionsOmeprazoleSister Chromatid Exchange2-PyridinylmethylsulfinylbenzimidazolesIntestinal NeoplasmsEscherichia coliHaemophilus influenzaeCefuroximeAdministration, OralAzithromycinLactamsAnti-Ulcer AgentsLansoprazoleFurazolidoneCefotaximeAnti-Infective AgentsRabeprazoleBacteria, AnaerobicPotassium Channel BlockersRespiratory Tract InfectionsPotassium Channels, Inwardly RectifyingCommunity-Acquired InfectionsPotassium, DietaryDrug Resistance, MicrobialMoraxella (Branhamella) catarrhalisMutagensDrug Resistance, Multiple, BacterialPotassium DeficiencyBismuthCefaclorPotassium Channels, Voltage-GatedThienamycinsHaemophilus InfectionsBacterial InfectionsBronchitis, ChronicPotassium CompoundsProton Pump InhibitorsActinomycetaceaeRats, Inbred F344Drug CombinationsPneumonia, PneumococcalUrinary Tract InfectionsAcute DiseaseCricetulusAnemiaTetracyclinePneumococcal InfectionsLevofloxacinTreatment OutcomeDouble-Blind Method