Poor Therapeutic Response in Female Pattern Hair Loss: Mechanisms and a Practical Framework for Clinical Management

Female pattern hair loss (FPHL) is the most common cause of hair loss in women, yet therapeutic responses remain highly variable. A substantial proportion of patients experience persistent hair thinning or limited hair density improvement despite standard therapies, and current guidelines provide limited guidance for managing patients with poor therapeutic response.

This review summarizes the major determinants of poor therapeutic response in FPHL, including pharmacogenetic factors, metabolic and endocrine comorbidities, treatment-related barriers, and advanced follicular miniaturization. Emerging evidence suggests that androgen receptor (AR) polymorphisms may influence antiandrogen responsiveness, whereas sulfotransferase (SULT1A1) activity may affect topical minoxidil efficacy. Obesity-related insulin resistance and polycystic ovary syndrome may further impair the follicular microenvironment through hyperandrogenism and chronic inflammation. Based on current evidence, we propose a practical three-step framework for evaluating poor responders: exclusion of pseudo-nonresponse, identification of metabolic-endocrine comorbidities, and incorporation of emerging biomarkers to support individualized treatment selection.

Poor therapeutic response in FPHL is multifactorial. Identifying the dominant contributing factor rather than simply escalating treatment intensity may facilitate precision management and improve outcomes in refractory patients.