A systematic review and meta-analysis of efficacy and safety of compound glycyrrhizin combined with second-generation non-sedated antihistamine for the treatment of chronic urticaria.

Background: Chronic urticaria (CU) is a prevalent dermatologic disease that negatively affects life, current therapies remain suboptimal. Hence, there is an urgent need to identify effective and safe treatment.
Objective: Assess the efficacy and safety of compound glycyrrhizin (CG) combined with second-generation nonsedated antihistamine for the treatment of CU.
Methods: Nine databases were queried to screen RCTs related. Two reviewers independently assessed the risk of bias using Cochrane Collaboration. Primary objective was the total efficiency rate, while secondary was rate of recurrence, adverse events, and cure. Statistical analyses using Review Manager 5.4 and Stata17.
Results: Twenty-four RCTs were identified. Significant differences were noted in rate of total efficiency ( n  = 2649, RR = 1.36, 95%CI:1.30-1.43, p  < 0.00001), cure ( n  = 2649, RR = 1.54, 95%CI:1.42-1.66, p  < 0.00001) and recurrence ( n  = 446, RR = 0.34, 95%CI:0.20-0.58, p  < 0.00001) between the combination of CG with second-generation non-sedated antihistamine and antihistamine monotherapy. Contrastingly, adverse events rate ( n  = 2317, RR = 0.76, 95% CI:0.59-0.97, p  = 0.03) was comparable between the two groups. Our results indicated that CG combined with second-generation non-sedated antihistamine could significantly mitigate the symptoms in CU compared with antihistamine monotherapy. No serious adverse events were reported.
Conclusions: CG combined with second-generation nonsedated antihistamine is effective for CU. Nevertheless, higher-quality studies are warranted to validate our results.