Efficacy of topical gabapentin in women with primary macular amyloidosis: A side‐by‐side triple‐blinded randomized clinical trial

Abstract

BackgroundPrimary cutaneous macular amyloidosis (PCMA) is a chronic pruritic cutaneous disease characterized by heterogeneous extracellular deposition of amyloid protein in the skin.AimsThis study aimed to evaluate the efficacy of topical 6% gabapentin cream for the treatment of patients with PCMA.Materials and MethodsIn this triple‐blind clinical trial, a total of 34 patients, who were diagnosed with PCMA, treated using two different strategies of topical gabapentin as the active group and vehicle cream as the control group.ResultsPruritus score reduction in both groups was statistically significant compared with the baseline value (p < 0.001). There was a significant pigmentation score reduction in intervention group compared with control group after 1 month of the study (p < 0.001). The differences of pigmentation score changes between the groups were not significant at month 2 (p = 0.52) and month 3 (p = 0.22).ConclusionsThe results of this study suggest that topical gabapentin cream may be effective as a topical agent in the treatment of pruritus associated with PCMA without any significant adverse effects. It is recommended to perform similar studies with a larger sample size and longer duration in both sexes.