Drug Utilization Pattern and Clinical Outcomes in Patients with Chronic Kidney Disease
Introduction: Chronic kidney disease (CKD) is commonly associate ed with hypertension, diabetes mellitus, anemia, fluid and electrolyte disturbances, mineral-bone abnormalities, and cardiovascular disease, resulting in the use of multiple medications. Altered renal elimination and the frequent requirement for dose modification make rational prescribing particularly important in this population. Objective: To evaluate the pattern of drug utilization and associated clinical outcomes among patients with chronic kidney disease attending a tertiary-care teaching hospital. Materials and Methods: A prospective observational study was conducted in the Department of Pharmacology in collaboration with the concerned clinical departments at Chirayu Medical College&Hospital, Bhopal, Madhya Pradesh, from February 2015 to January 2016. One hundred adult patients diagnosed with CKD were included. Demographic characteristics, CKD stage, associated comorbidities, medications prescribed, route of administration, generic prescribing, use of essential medicines, and selected clinical and laboratory outcomes were recorded. Drug utilization was evaluated using World Health Organization prescribing concepts. Clinical outcomes included blood-pressure control, change in hemoglobin, serum creatinine and estimated glomerular filtration rate (eGFR), need for dialysis, symptomatic improvement, adverse drug reactions, hospitalization, and mortality. Results: The mean age of the study population was 55.8 ± 13.1 years, and 61% were male. Hypertension was present in 78%, diabetes mellitus in 46%, and anemia in 68% of patients. Stage 4 CKD was the most frequent stage (31%), followed by stage 3 (29%) and stage 5 (25%). A total of 612 medications were prescribed, corresponding to 6.12 ± 2.03 drugs per patient. Antihypertensive agents were the most frequently prescribed drug group (86%), followed by hematinics/erythropoiesis-stimulating therapy (68%), gastrointestinal drugs (55%), calcium and vitamin D preparations (47%), diuretics (44%), antidiabetic agents (42%), phosphate binders (38%), and antiplatelet/hypolipidemic agents. At follow-up, satisfactory blood-pressure control was achieved in 64.1% of hypertensive patients. Mean hemoglobin increased from 8.9 ± 1.7 to 9.8 ± 1.6 g/dL among anemic patients. Renal function remained clinically stable in 58% of the cohort, deteriorated in 27%, and improved in 15%. Twenty-five patients required maintenance dialysis. Adverse drug reactions were observed in 13% of patients. Overall, 71% showed symptomatic improvement or clinical stability, 20% had disease progression requiring intensification of therapy or hospitalization, and four patients died during follow-up. Conclusion: Patients with CKD were exposed to considerable polypharmacy because of multiple disease-related complications and comorbidities. Antihypertensive agents, anemia-related therapies, mineral-bone disorder treatments, and diuretics accounted for a major proportion of drug use. Appropriate selection and renal dose adjustment of medicines were associated with satisfactory control of blood pressure and improvement in anemia in a substantial proportion of patients. Regular prescription review and pharmacological monitoring are essential to promote rational drug use and improve outcomes in CKD.