Cell viability assays for drug screening and toxicity testing are essential tools in biomedical research. These assays measure the health and survival of cells exposed to potential therapeutics or toxic compounds, providing critical data on efficacy and safety. Techniques like MTT, ATP luminescence, and live/dead staining are widely used to evaluate cellular responses. By employing cell viability assays, researchers can identify promising drug candidates and minimize adverse effects, accelerating the development of safe and effective treatments.