RESUMO
Objective: To assess the magnitude of generic-generic and brand-generic medication switching and its impact on patients' understanding and the potential risk of medication errors. Methods: The study composed of 2 parts. The first part is a retrospective study to measure the frequency of medications switching in King Faisal Specialist Hospital and Research Centre (KFSH&RC), from 1st of January 2015 to the 31st of December, 2020. Brand medications that were switched to generic medications, generic medications that were switched to brand medications and generic medications that were switched to other generic medications were included. Medications that were switched before or after the study period were excluded. The primary outcomes are the total percentage of switching from brand to generic of all medications in KFSH&RC drug formulary, frequency of generic-generic medications switching and percentage of switching back from generic to brand medications. The second part is a cross sectional survey-based study to assess patients' understanding of their medications and the potential for medication errors by assessing their ability to identify the discrepancies and duplications utilizing a validated questionnaire. Results: Over 5 years, the number of generic medications increased from 553 (35.5%) to 640 (41.1%) out of the 1554 formulary items. Percentage of switching from brand to generic over that 5-year period was 15.9%. Percentage of switching back from generic to brand was 12.8%. Total number of generic medications that had been switched to other generic medications was 256 (16.5%). Out of the 218 patients who had been switched from generic to generic medication, only 43 patients (19.7%) knew the indication for the generic medication they were taking. One hundred forty-six patients (67%) knew the indication of generic medications exclusively by their physical "trademark" characteristics, with 11.5% unrecognized duplication. Conclusion: There is a clear tendency to switch brand medications to generics and to switch between generics. We found the percentage of subsequent switching back to branded products is alarming. Frequent switching between medications negatively impacted patient comprehension and resulted in medication duplication. There is a crucial need for appropriate medication counseling and medication use ecosystem redesign.