AspirinWarfarinPlatelet Aggregation InhibitorsAnticoagulantsPlatelet Function TestsTiclopidineAnti-Inflammatory Agents, Non-SteroidalVitamin K Epoxide ReductasesPlatelet AggregationFibrinolytic AgentsThromboxane B2ThrombosisDrug Therapy, CombinationStrokeHemorrhageRisk FactorsBlood PlateletsTreatment OutcomeDose-Response Relationship, DrugProspective StudiesThromboembolismAtrial FibrillationProthrombin TimeDrug Administration ScheduleDouble-Blind MethodRisk AssessmentMixed Function OxygenasesFollow-Up StudiesTime Factorsbeta-AlanineVitamin KCardiovascular DiseasesCoronary DiseaseAryl Hydrocarbon HydroxylasesRodenticidesPharmacogeneticsDrug InteractionsSalicylatesCyclooxygenase InhibitorsDrug MonitoringVitamin K 1Blood CoagulationIntracranial HemorrhagesAdministration, OralDrug Dosage Calculations4-HydroxycoumarinsBenzimidazolesEmbolismPhenylbutazoneGastrointestinal HemorrhageHeparin, Low-Molecular-WeightVenous ThrombosisDrug ResistanceHerb-Drug InteractionsSodium SalicylateThrombophlebitisHeparinPyridonesCarbon-Carbon LigasesRodent ControlAcenocoumarolAntithrombinsVitamin K DeficiencyVenous ThromboembolismRetrospective StudiesCohort StudiesPlatelet Activation