Introduction: Pharmacotherapy follow-up is a service that meets the needs of polymedicated patients but invests a lot of resources. The aim of this study was to determine the changes in drug dispensation due to pharmacotherapy follow-up and the resources invested in the service and its associated costs.
Methods: Twenty patients in risk of drug related problems entered a pharmacotherapy follow-up program for six months using Dader´s method. Material, information and human resources were registered and their cost calculated.
Results: Number of dispensed drugs to the patients in the program decreased 8.4 %. Pharmacotherapy follow-up costs for each patient in the program was 87 euros and increased as did drug related problems risk factors.
Discussion: Pharmacotherapy follow-up decreases pharmacy incomes on decreasing drug dispensation. Besides, pharmacist´s working time increases, as well as its costs. A pharmacotherapy follow-up service in this pharmacy could nearly be paid by the medicines saved.