RanitidineFoscarnetHistamine H2 AntagonistsCimetidineBismuthAnti-Ulcer AgentsFamotidinePhosphonoacetic AcidGanciclovirAntiviral AgentsCytomegalovirus RetinitisFuransDuodenal UlcerMagnesium HydroxideGastric Acidity DeterminationOmeprazoleGastric AcidSucralfateAcyclovirOrganophosphorus CompoundsCytomegalovirus InfectionsAntacidsCytomegalovirusStomach UlcerHeartburnOrganophosphonatesAluminum HydroxideSkin Diseases, ViralRetinitisCytosineDouble-Blind MethodReceptors, Histamine H2Stomatitis, HerpeticDrug Therapy, CombinationVirus ReplicationDrug Resistance, ViralEnprostilClarithromycinHerpes LabialisAIDS-Related Opportunistic InfectionsHistamine AntagonistsEsophagitis, PepticMetronidazole2-PyridinylmethylsulfinylbenzimidazolesHerpes SimplexAcquired Immunodeficiency SyndromeGastric JuiceHelicobacter pyloriPeptic UlcerAmoxicillinHistamineZidovudineHelicobacter InfectionsDrug InteractionsAdministration, TopicalNizatidineHalf-LifeDrug Resistance, MicrobialLansoprazoleDNA-Directed DNA PolymerasePyrilamineRoseolovirus InfectionsProton Pump InhibitorsHistamine AgonistsDrug CombinationsReceptors, HistamineOintmentsGastric MucosaReverse Transcriptase InhibitorsInterferonsViral Plaque AssayHerpesvirus 6, HumanChlorpheniramine