Renal Dose Adjustment in European Primary Care: Clinical Nuances and Practical Challenges

Appropriate dose adjustment of renally eliminated medicines is central to safe pharmacotherapy in patients with chronic kidney disease; yet, in European primary care, it is systematically undermined not by lack of knowledge, but by structural misalignment between laboratory reporting, regulatory product information, and clinical guidelines. This Perspective argues that the core barrier to optimal renal dose adjustment is a mismatch between routinely reported indexed eGFR and dosing requirements based on absolute renal function, compounded by persistent regulatory reliance on the Cockcroft-Gault equation despite its known limitations. We show how these structural inconsistencies, together with patient-related factors such as frailty, ageing, and body size, generate uncertainty at the point of prescribing and contribute to persistent variability in dosing decisions. To address this challenge, we propose a structured, context-aware renal dosing framework designed for routine primary care. The framework integrates regulatory guidance, multiple methods of renal function estimation, and patient-specific modifiers into a stepwise decision process. Clinical vignettes illustrate how divergent renal function estimates and regulatory requirements can lead to different dosing decisions in everyday practice. By reframing renal dose adjustment as a context-driven clinical process rather than a purely equation-based task, this Perspective highlights the need for regulatory alignment and pragmatic decision tools to improve prescribing quality in patients with chronic kidney disease.