Lifelong, Universal Pneumocystis jirovecii Pneumonia Prophylaxis: Patient uptake and adherence after kidney transplant.

INTRODUCTION Pneumocystis jirovecii pneumonia (PJP) is a significant cause of morbidity and mortality in transplant patients yet little is known about their adherence to prophylaxis. The goal of this study was to evaluate patient uptake and long-term adherence after implementing universal, lifelong PJP prophylaxis. MATERIALS AND METHODS This retrospective cohort study evaluated an adult kidney transplant program 18-months after initiating trimethoprim-sulfamethoxazole (TMP-SMX) 80/400mg thrice-weekly following a cluster of PJP cases. The protocol incorporated multi-modal patient education and drug tolerability strategies to improve adherence, including a modified re-challenge strategy for TMP-SMX intolerance. Adherence was independently confirmed by the transplant pharmacist and nurse for each patient, with an a priori target ≥75% population on prophylaxis. RESULTS Initial uptake was high with 237/250 (94.8%) patients starting prophylaxis. Long-term maintenance was high with 192/237 (81.0 %) patients remaining on prophylaxis at 18-months. Of the remaining 45 patients who initiated prophylaxis, 36/237 (15.2%) were non-adherent and 9/237 (3.8%) discontinued prophylaxis by 18-months. Reasons for non-adherence included gastrointestinal upset, fear of drug reactions and cost; but the majority of reasons were not delineated by the patients (31/36, 86.1%). There was a statistically significant increase in serum creatinine 3.3µmol/L (0.3-6.3µmol/L 95%CI) and potassium 0.08mmol/L (0.03-0.15mmol/L 95%CI) in those prescribed TMP-SMX with only 3/237 (1.3%) patients discontinuing TMP-SMX for an increase in creatinine. CONCLUSION High rates of patient uptake (94.8%) and long-term adherence (81.0%) were observed after implementing universal lifelong PJP prophylaxis. This may be due in part to the in-depth patient education and drug tolerability strategies employed.