Short-Term Outcomes of Mirogabalin in Patients with Peripheral Neuropathic Pain: A Retrospective Study
Abstract Background: Mirogabalin, which is approved for the treatment of peripheral neuropathic pain in Japan, is a ligand for the α2δ subunit of voltage-gated calcium channels. Both pregabalin and mirogabalin act as nonselective ligands at the α2δ-1 and α2δ-2 subunits. Mirogabalin has a unique binding profile and long duration of action. Pregabalin has been reported to produce intolerable adverse effects in some patients. This study investigated outcomes associated with mirogabalin in patients with peripheral neuropathic pain who withdrew from treatment with pregabalin. Methods: We retrospectively assessed peripheral neuropathic pain in 187 patients (58 men, 129 women) who were treated with mirogabalin. All patients had been treated with pregabalin and withdrew from therapy due to lack of efficacy or adverse events. The mean age of patients was 72.3 years (range, 30–94 years), and mean duration of disease was 37 months (range, 3–252 months). Results: After treatment with mirogabalin for 1 week, numeric rating scale (NRS) scores decreased significantly compared with baseline, and continued to decrease over time . After 8 weeks, NRS scores improved by ³30% from baseline in 113 patients (69.3%). Twenty-four patients (12.8%) stopped mirogabalin treatment due to adverse events. Somnolence (26.7%), dizziness (12.3%), edema (5.9%), and weight gain (0.5%) were noted as adverse events of mirogabalin. Conclusions: The results of this investigation indicate that mirogabalin is safe and effective for reducing peripheral neuropathic pain.