ObjectiveKetogenic diet (KD) has shown promising efficacy in the treatment of super-refractory status epilepticus (SRSE); however, its adverse effects have not been systematically evaluated. This study aimed to analyze the safety profile of adjunctive KD therapy for SRSE and explore potential risk factors. MethodsProspective data from 13 SRSE patients (3 adolescents, 10 adults; mean age 34.6±18.4 years) at Xuanwu Hospital, Capital Medical University (July 2020–December 2024) who received KD adjunctive therapy after failing conventional treatments were collected. Adverse reactions were observed, and a systematic literature review (up to March 2025) was conducted for meta-analysis. ResultsIn the single-center cohort of 13 patients, common adverse events included gastrointestinal intolerance (53.8%), hematologic and metabolic abnormalities such as thrombocytosis (84.6%), hyperammonemia (76.9%), dyslipidemia (69.2%), and hypocalcemia (69.2%), as well as nutritional deficits including hypoalbuminemia (61.5%), anemia (53.8%), and transient weight loss (61.5%). Most adverse events were transient and reversible with timely adjustments to the KD regimen. The meta-analysis (25 studies, 251 cases; mean age 16.1±19.0 years) revealed a spectrum of major adverse events, including gastrointestinal intolerance (26.7%), hypoglycemia (19.1%), acidosis (17.5%), and hyperlipidemia (12.0%). ConclusionsThe ketogenic diet as adjunctive therapy for super-refractory status epilepticus demonstrates a manageable safety profile. Reported adverse events are primarily confined to gastrointestinal intolerance, metabolic derangements, and nutritional deficits, with notable occurrences of thrombocytosis and hyperammonemia requiring timely clinical management. This study provides critical evidence-based support for KD implementation in SRSE treatment protocols.