SumatriptanAspirinHeadacheHeadache DisordersMigraine DisordersSerotonin Receptor AgonistsCluster HeadacheTension-Type HeadacheReceptor, Serotonin, 5-HT1DTryptaminesReceptor, Serotonin, 5-HT1BVascular HeadachesReceptors, SerotoninErgotamineHeadache Disorders, SecondaryMedication ErrorsMedication AdherenceDihydroergotamineSerotonin 5-HT1 Receptor AgonistsVasoconstrictor AgentsMethiothepinSerotonin AntagonistsAnti-Inflammatory Agents, Non-SteroidalArteriovenous AnastomosisNaproxenMigraine without AuraDura MaterPlatelet Aggregation InhibitorsProchlorperazineMedication ReconciliationMedication SystemsMeningeal ArteriesMedication Systems, HospitalOxadiazolesDouble-Blind MethodSerotoninKetanserinTreatment OutcomeIndolesProstaglandin Endoperoxides, SyntheticAnalgesicsTrigeminal NerveSulfonamidesTrigeminal Nucleus, Spinal15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidDrug Therapy, CombinationSelf MedicationMethysergideDose-Response Relationship, DrugThromboxane A2Organotin CompoundsTrigeminal GanglionInjections, SubcutaneousIndependent Practice AssociationsProspective StudiesTiclopidinePatient ComplianceDrug InteractionsDrug CostsPrescription DrugsDrug PrescriptionsCalcitonin Gene-Related PeptideThromboxane B2Cross-Over StudiesPiperazinesAdministration, Oral