Background: We aimed to compare the use of sugammadex to that of neostigmine in association with the occurrence of postoperative nausea and vomiting (PONV) during the first 24 h following general anesthesia.Methods: This retrospective cohort study included 10,912 patients who underwent elective surgery under general anesthesia in 2020 at an academic medical center in Seoul, South Korea. The exposure groups were determined according to whether the patient received sugammadex or neostigmine as a reversal agent. Demographic and perioperative variables, including PONV occurrence, were collected from the electronic medical records. The primary outcome was PONV occurrence during the first 24 h postoperatively (overall). Secondary outcomes were PONV occurrence during 0–2 h (early) and 2–24 h (delayed) postoperatively, and antiemetic use during the first 24 h postoperatively. The associations between the type of reversal agent and primary and secondary outcomes were investigated using logistic regression, while adjusting for confounding variables using stabilized inverse probability of treatment weighting (sIPTW). An interaction analysis was also performed to investigate whether the type of general anesthesia influenced the association between sugammadex use and PONV occurrence.Results: Of the 10,912 patients included in this study, 5,918 (54.2%) received sugammadex. Sugammadex (vs. neostigmine) was found to be significantly associated with the occurrence of overall PONV (15.8 vs. 17.7%; odds ratio [OR], 0.87; 95% confidence interval [CI], 0.79–0.97; P = 0.010), the occurrence of early PONV (7.6 vs. 9.7%; OR, 0.77; 98.7% CI, 0.65–0.91; P < 0.001), and antiemetic use within 24 h postoperatively (11.8 vs. 14.3%, OR, 0.80; 98.3% CI, 0.70–0.92; P < 0.001) after sIPTW. There was no evidence of interactions between sugammadex use and type of anesthesia for the primary and secondary outcomes.Conclusions: Compared with neostigmine/glycopyrrolate, sugammadex use was associated with a lower occurrence of PONV during the first 24 h following general anesthesia. Additionally, there was no significant interaction between the type of reversal agent and type of general anesthesia related to overall PONV occurrence. However, our retrospective study design precludes a firm conclusion regarding the effect of sugammadex on PONV after general anesthesia.Trial registration: not applicable