Non-steroidal Anti-inflammatory Drug Prescriptions in Living Kidney Donors: A Retrospective Cohort Study.

Background: Current guidelines recommend that living kidney donors should avoid non-steroidal anti-inflammatory drugs due to their potential nephrotoxic effects. It is unclear if physicians are adhering to this recommendation.

Objective: Our aim was to determine the proportion of living kidney donors that filled a non-steroidal anti-inflammatory drug prescription post-donation and the proportion with measurement of kidney function post-prescription.

Design: We conducted a population-based, retrospective cohort study.

Setting: We identified kidney donors in Alberta, Canada that had accessed the healthcare system in the outpatient, emergency department, or inpatient setting.

Patients: Adult living kidney donors in Alberta, Canada who donated between 2002 and 2019.

Measurements: We measured the number of non-steroidal anti-inflammatory drug prescriptions, type of prescribing physician, and evidence of post-prescription measurement of creatinine and potassium.

Methods: We identified the proportion of donors who filled a non-steroidal anti-inflammatory drug prescription at least 1 year post-donation. We also assessed how many donors underwent laboratory testing for kidney function and potassium within 14 days following the first prescription.

Results: Of the 759 living kidney donors included in our study, 273 (36%) had at least one non-steroidal anti-inflammatory drug prescription over a median follow-up of 7.2 years (interquartile range 3.5-11.5). The proportion of donors with at least one prescription in follow-up remained stable over time (~10% per year). Family physicians accounted for 66% of all non-steroidal anti-inflammatory drug prescriptions. Approximately, 10% of donors had measurements of serum creatinine or potassium post-prescription.

Limitations: This study was limited by the inability to capture over-the-counter non-steroidal anti-inflammatory drug use, indication for the prescriptions, and indication for bloodwork being completed in the post-prescription period.

Conclusions: Over one-third of living kidney donors are prescribed non-steroidal anti-inflammatory drugs despite current guideline recommendations, with only a minority undergoing post-prescription laboratory testing. Further research assessing outcomes following non-steroidal anti-inflammatory drug use is recommended to better inform optimal pain-management strategies for living kidney donors.