Exposure-Associated Physiologic Reactions (EAPR): A Novel Clinical Framework for Multisystem Adverse Responses

Exposure-associated physiologic reactions (EAPR) represent unexpected physiologic responses to medications, food additives, environmental exposures, and immunologic stimuli that are increasingly encountered in modern clinical practice. While most exposures are well-tolerated, a subset of individuals develops disproportionate, multisystem responses that do not conform to traditional models of hypersensitivity, toxicity, or pharmacologic effect. These reactions are frequently misattributed to primary disease processes due to their atypical and transient nature, leading to diagnostic uncertainty and unnecessary investigation. Emerging clinical observations suggest that such responses may represent a broader and previously underrecognized phenomenon. This review proposes the concept of EAPR as a unifying clinical framework describing non-classical, often non-IgE-mediated responses to pharmacologic, dietary, environmental, and immunologic exposures. Drawing upon case-based evidence involving cardiovascular, renal, neurologic, ophthalmologic, and autonomic manifestations, this article integrates diverse observations into a cohesive mechanistic and diagnostic model. Recognition of EAPR may improve diagnostic accuracy, reduce unnecessary investigations, and enhance pharmacovigilance by integrating fragmented clinical observations into a coherent and clinically actionable framework. This framework is intended as a conceptual and hypothesis-generating model and requires further validation through systematic investigation.