Local and systemic safety of deproteinized calf blood extract injection: hypersensitivity, hemolysis, local tolerance, and acute intravenous toxicity in rodents and rabbits.

Introduction: Deproteinized calf blood extract injection (DCBEI) is widely applied in neurology and wound care, but systematic preclinical safety data are scarce. Because it is administered parenterally, assessment of immunogenicity, hemocompatibility, local tolerance, and acute toxicity is essential to meet regulatory standards. Methods: A focused safety package was developed, comprising: (i) active systemic anaphylaxis (ASA) in Hartley guinea pigs (n = 24, 4 groups); (ii) Results: No DCBEI-treated animals developed ASA reactions ≥ grade 2 (0/6), while all ovalbumin controls showed severe grade 4 responses. Hemolysis remained ≤4.88% across all concentrations and timepoints, consistent with saline controls and below the 5% non-hemolytic threshold. Local tolerance was favorable, with macroscopic scores of 0 and no histopathological abnormalities after single or repeated administration. Acute dosing produced a dose-dependent mortality curve, yielding an LD Conclusion: This route-relevant dataset establishes a compact preclinical safety foundation for DCBEI, supporting its continued clinical use and guiding future investigations into long-term toxicology and translational risk management.