Computer support of pharmaceutical services for ambulatory patients

Area of Science:

• Health Informatics
• Clinical Pharmacy
• Computer Science in Medicine

Background:

• Computerized systems are increasingly used in healthcare to enhance efficiency and patient safety.
• Pharmaceutical services require robust systems for managing patient data and medication profiles.
• The need for automated drug interaction and duplication checks is critical in high-volume outpatient settings.

Purpose of the Study:

• To describe a prototype Computerized Pharmaceutical Services Support System (CPSSS).
• To evaluate the system's capability in identifying potential medication-related problems.
• To assess the impact of pharmacist intervention, prompted by the system, on physician prescribing behavior.

Main Methods:

• Development and implementation of a CPSSS managing records for ~40,000 patients and ~1,300 daily outpatient prescriptions.
• Automated generation of prescription labels with auxiliary information.
• Computerized screening of patient profiles for drug-drug, drug-disease, drug-allergy, and drug-laboratory test interactions, plus duplicate therapy detection.
• Prospective review of new prescriptions and retrospective analysis of patient demographics and prescribing patterns.

Main Results:

• CPSSS identified potential interactions or duplicate therapy in approximately 2% of new prescriptions.
• About 30% of new prescriptions exactly duplicated an existing active prescription.
• Physicians altered therapy in 73% of cases for duplicate therapy, 27% for drug-disease interactions, and 32% for drug-drug interactions following pharmacist consultation.
• Diuretics (32%) and tranquilizers (30%) were the most common drug classes.

Conclusions:

• The CPSSS effectively identifies significant medication errors, including duplicate therapies and potential interactions.
• Pharmacist-led interventions based on CPSSS alerts are highly effective in modifying physician prescribing practices.
• Computerized pharmaceutical support systems are valuable tools for enhancing medication safety and optimizing patient care in outpatient settings.