ABSTRACT Background and Objective: It has been shown that clinical pharmacists positively influence quality of care and decrease drug expenditures in hospital settings. This 2-part study was undertaken to evaluate the impact of a clinical pharmacist on patient and economic outcomes in a pediatric mental health setting.Methods: In the first part of the study, a 4-week prospective evaluation period, pharmacist-initiated interventions were documented. This information was distributed to a panel of assessors, who determined the impact of each intervention on patient care. In the second part of the study, a retrospective cost analysis was used to compare drug costs for 2 consecutive years, the 12-month period before and the 12-month period immediately after institution of the clinical pharmacy position. A matched-pair t-test and regression analysis were conducted on the cost data.Results: The pharmacist initiated 48 interventions during the 4-week period, 47 (98%) of which were accepted by the treating physician. Eighty-six percent (38/44) of the interventions were assessed as having a positive effect on patient care. Drug cost per patient-day was 14% lower in the year after implementation of the pharmacy position, and the difference was statistically significant in the last 8 months of that year (p = 0.0019). Total drug costs decreased by 21%, a cost saving of 5485.80.Conclusions:Theclinicalpharmacisthadapositiveimpactonbothclinicalandeconomicoutcomesinthispediatricmentalhealthpopulation.REˊSUMEˊHistoriqueetobjectif:Onadeˊmontreˊquelespharmacienscliniciensinfluaientpositivementsurlaqualiteˊdessoinsetfaisaientbaisserlecou^tdesmeˊdicamentsenmilieuhospitalier.Cetteeˊtudededeuxphasesaeˊteˊmeneˊepoureˊvaluerl’incidencedesinterventionsdupharmacienclinicienentermesdereˊsultatstheˊrapeutiquesetdereˊpercussionseˊconomiquesdansuneˊtablissementdesoinsdesanteˊmentalepourenfants.Meˊthodes:Danslapremieˋrephasedel’eˊtude,soitunepeˊrioded’eˊvaluationprospectivedequatresemaines,lesinterventionsentreprisesparlepharmacienonteˊteˊdocumenteˊes.L’informationainsirecueillieaeˊteˊdistribueˊeaˋuncomiteˊquiaeˊvalueˊl’incidencedechaqueinterventionsurlessoinsaupatient.Danslasecondephasedel’eˊtude,uneanalysereˊtrospectivedescou^ts—aumoyend’untestdeStudentapparieˊetd’uneanalysedereˊgression—aeˊteˊmeneˊepourcomparerlecou^tdesmeˊdicamentssurunepeˊriodededeuxanneˊesconseˊcutives,soitlapeˊriodededouzemoisavantetcelleimmeˊdiatementapreˋslamiseenplacedupostedepharmacienclinicien.Reˊsultats:Des48interventionsentreprisesparlepharmaciendurantlapeˊriodedequatresemaines,47(98.Conclusion : Le pharmacien clinicien a eu une incidence positive à la fois sur les résultats thérapeutiques et sur les coûts au sein de cette population d’enfants en milieu de soins de santé mentale