AspirinPlatelet Aggregation InhibitorsAnti-Inflammatory Agents, Non-SteroidalTiclopidinePlatelet Function TestsPlatelet AggregationThromboxane B2Fibrinolytic AgentsDouble-Blind MethodDrug Therapy, CombinationMedication AdherenceMedication ErrorsWarfarinDose-Response Relationship, DrugDrug Administration ScheduleThrombosisTreatment OutcomeAnticoagulantsBlood PlateletsAdministration, OralRisk FactorsProspective StudiesTime FactorsFollow-Up StudiesStrokeRisk AssessmentCyclooxygenase InhibitorsCardiovascular DiseasesMedication SystemsMedication ReconciliationArea Under CurveHalf-LifeCross-Over StudiesMedication Systems, HospitalSalicylatesCoronary DiseaseDrug InteractionsBiological AvailabilitySodium SalicylatePatient ComplianceHemorrhageDrug PrescriptionsPlacebosSelf MedicationTablets, Enteric-CoatedAsthma, Aspirin-InducedPrescription DrugsIbuprofenDrug TherapyDrug UtilizationGastrointestinal HemorrhageCyclooxygenase 1PolypharmacyBleeding TimeProstaglandin-Endoperoxide SynthasesUnited StatesPlatelet ActivationInjections, IntravenousAcetaminophenThromboxanesCyclooxygenase 2 InhibitorsPsychotropic DrugsThromboxane A2Retrospective StudiesNonprescription DrugsDrug Resistance