Toxicology

Toxicology constitutes the scientific discipline studying adverse effects of chemical, physical, or biological agents on living organisms, encompassing mechanisms of toxicity, dose-response relationships, risk assessment, and safety evaluation supporting pharmaceutical development, environmental protection, and occupational health. This multidisciplinary field integrates chemistry, biology, physiology, pathology, and statistics investigating how substances cause harm.

The pharmaceutical industry conducts comprehensive toxicological evaluations throughout development ensuring therapeutics meet safety standards before human exposure and throughout clinical use. Regulatory toxicology follows standardised protocols conducting Good Laboratory Practice studies including single and repeated-dose toxicity, reproductive and developmental toxicity, genotoxicity, carcinogenicity, and immunotoxicity assessments. Endpoints include mortality, clinical observations, body weights, food consumption, clinical pathology parameters, organ weights, and histopathological examination. Safety margins compare no observed adverse effect levels in animals to proposed human exposures. Mechanistic studies employ molecular, cellular, and genomic approaches understanding toxicity pathways. Alternative methods including in vitro assays, computational modelling, and human-relevant systems increasingly supplement or replace animal studies. Risk assessment integrates toxicology data with exposure estimates determining acceptable safety profiles. As the field advances through improved mechanistic understanding and validated alternative methods, toxicology continues ensuring pharmaceutical safety through comprehensive, scientifically rigorous evaluation.