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Adherence to growth hormone therapy in children and its potential barriers

Abstract Background: One of the main concerns in chronic diseases such as growth hormone (GH) deficiency is adherence to the treatment, which significantly affects treatment outcomes. Methods: This cross-sectional study was conducted among 169 GH recipient children (2–12 years) and teens (13–19 years) referred to a GH distributing teaching pharmacy. The eight-item Morisky Medication Adherence Scale (MMAS) and auto-compliance method were used for the assessment of patients’ adherence to GH. The potential barriers to GH therapy adherence and medication persistence were also explored. Results: Based on the MMAS method, 56.7% of the children and 57.9% of the adolescent groups were adherent to GH therapy. Conversely, according to the auto-compliance method almost all the patients were adherent in the children (95.2%) and adolescent (95.5%) groups. Forgetting to take the injection or refill the prescription, being away from home, exhaustion from long-term injection, drug shortage and inaccessibility to the pharmacy were barriers found to be significantly associated with a low adherence in the children group. While in the adolescent group, forgetting to take the injection, painful injection, concern about long-term complications and exhaustion from long-term injection revealed a significant association with low adherence. Persistence with GH therapy was reported in 75.3% and 67% of children and adolescent patients, respectively. Conclusions: The current study revealed that overall adherence of the study population is low. Considering the barriers with significant association with adherence, different strategies can be incorporated to enhance adherence to GH therapy, i.e. providing early patient and parent education and support, medication reminder systems and longer duration of GH prescriptions.