The use of animals in medical and pharmaceutical research raises profound ethical questions about the welfare costs of research and the obligation to develop and use alternatives wherever possible.
Medical animal research involves a genuine ethical tension between animal welfare and human health benefit that cannot be dismissed from either direction. Animals used in research experience real suffering — pain, distress, fear and deprivation — that demands ethical justification and minimisation. The Three Rs framework provides a practical ethics of minimisation: replace animal methods with alternatives wherever possible, reduce numbers used through better experimental design, and refine procedures to minimise suffering when animal use is unavoidable. High-welfare research practice is not in tension with good science — well-designed studies using the minimum necessary animals under the best welfare conditions produce more reliable and reproducible results than poorly designed studies with excessive numbers under poor conditions.