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Background Second-generation triazoles including posaconazole are highly efficacious for the prophylaxis and salvage treatment of life-threatening invasive fungal diseases. All triazoles have been associated with hepatic adverse events (AEs), which may affect their clinical use; however, risk factors for those AEs are poorly defined. Methods Reports of hepatobiliary AEs for posaconazole from clinical trials and post-market use in our company’s global safety database were reviewed to characterize concomitant medical conditions and drug exposure. Results As of 2018, 444 cases of hepatic AEs were reported; 139 (31%) led to discontinuation of posaconazole. Most hepatic AEs had a time to onset &gt;20 days (55.5%). The most frequent AEs reported (per Medical Dictionary for Regulatory Activities) were: Hyperbilirubinaemia (17%); Hepatotoxicity (13.5%); Hepatic function abnormal (11.5%); and Hepatocellular injury (11.3%). Most patients were adults (18–64 years old) (65%). Hematological malignancy (128 cases, 29%) and hematopoietic stem cell transplant (91 cases, 20%) were leading concurrent medical conditions. Notably, 75% of the cases reported exposure to other drugs (often multiple ones) with known risks for drug-induced liver injury (DILI, e.g., acetaminophen, cytarabine, cyclosporine). Among 139 cases in which posaconazole treatment was discontinued due to hepatic AEs, 6 of the 20 most frequently used co-medications (used by &gt;4.5% of the cases) were classified by the FDA in its DILIRank as “Most-DILI-Concern” (resulting in drug withdrawal, or prominent labeling for severe DILI risk in boxed warning or warnings and precautions), and 7 were “Less-DILI-concern” drugs (DILI risk language in warnings and precautions or adverse reactions). Similarly, of the top 35 concomitant medications for the entire group, 9 are classified as “Most-DILI-Concern” and 12 are “Less-DILI Concern” drugs. Conclusion The use of concomitant medications with known risks for hepatic injury appears to be an important contributor to the development of hepatotoxicity in patients treated with posaconazole. Co-administration of these drugs with anti-fungal triazole agents such as posaconazole, when needed, will continue to be carefully monitored. Disclosures All authors: No reported disclosures.

open forum infectious diseases

702. Hepatic Safety Among Patients Treated with Anti-Fungal Triazole Agent Posaconazole: Characterization of Adverse events in a Manufacturer’s Safety Database