Ampicillin Trihydrate is a beta lactam antibiotic widely used in laboratory research for bacterial selection and antimicrobial control. It inhibits cell wall synthesis by targeting penicillin binding proteins, leading to bacterial cell death. This compound is effective against many Gram positive bacteria and selected Gram negative species. It is commonly used in molecular biology applications, particularly for selecting transformed bacterial cells that carry ampicillin resistance genes. The reagent is suitable for incorporation into culture media and supports reliable experimental outcomes by preventing unwanted bacterial growth. It is extensively used in cloning, microbiology, and pharmaceutical development laboratories.