Acute Endotoxemia Associated With Contaminated Injectable Medicines: A Comprehensive Review Of Clinical Manifestations, Pathophysiology, And Patient Safety

Abstract

Background: Acute endotoxemia caused by tainted injectable drugs is a serious and sometimes fatal clinical occurrence. Bacterial endotoxins (lipopolysaccharides [LPS] of the outer membrane of gram-negative bacteria) are among the most potent pyrogens known to medicine.

Objective: This review aims to provide an overview of the clinical signs and pathophysiology of acute endotoxemia related to injectable drugs and the safety issues for patients, with specific focus on regulatory aspects, detection methods and current contamination incidents.

Methods: We did a structured literature search in PubMed/MEDLINE, Scopus, Web of Science, Embase, and the Cochrane Library between January 2000 and December 2025. Regulatory warnings were discovered from the Drug Regulatory Authority of Pakistan (DRAP), US Food and Drug Administration (FDA) and Central Drugs Standard Control Organization (CDSCO), India. A narrative thematic synthesis was performed on the 127 available sources.

Results: The K/M formula (Limit = K/M, K = 5 EU/kg for intravenous and 0.2 EU/kg for intrathecal injection) is the regulatory basis for endotoxin control. Endotoxin is recognized by Toll-like receptor 4 (TLR-4), which activates a cascade of pro-inflammatory cytokines (TNF-α, IL-1, IL-6) resulting in fever, hypotension, coagulopathy and multi-organ failure. Recent regulatory notices from India, Pakistan and the United States indicate that contamination problems continue to harm hospitalized, cardiac and immunocompromised patients. New recombinant Factor C (rFC) tests provide sustainable alternatives to conventional Limulus Amebocyte Lysate (LAL) testing.

Conclusion: Post-marketing surveillance needs to be strengthened and detection methods improved to prevent acute endotoxemia from injectable drugs under appropriate regulatory enforcement. International harmonisation of pharmacopeial standards is required to protect the health of patients from this preventable iatrogenic condition.