Signal mining study of severe cutaneous adverse events of valaciclovir or acyclovir based on the FAERS database

This study aimed to explore a comprehensive empirical investigation and assess SCARs related to valaciclovir or acyclovir based on FAERS database from FDA, thus providing a theoretical foundation for the rational application of drugs in clinic.SCARs reports relevant to valaciclovir or acyclovir were searched in FAERS database from the 2004 Q1 to 2023 Q2. These data were further mined by a proportional analysis and Bayesian approach to detect signals of SCARs caused by two drugs. Meanwhile, the clinical characteristics, onset time, correlation, and stratification analysis of the two drugs in SCARs were analyzed.Both drugs exhibited positive signals for drug reaction with DRESS, AGEP, TEN, SJS-TEN overlap and SJS. The median onset time of SCARs caused by valaciclovir or acyclovir was 30 days vs 10 day for DRESS, 11 days vs 9 days for AGEP, 17 days vs 12 days (TEN) and 12 days vs 8 days (SJS). Excluding the effect of combinational drugs, there was an association between the two antiviral drugs and SCARs.By analyzing the FAERS database, the risk trends of SCARs caused by valaciclovir or acyclovir have been identified, providing valuable insights to recognize various types of SCARs in clinics.