Cephalexin monohydrate (Standard) is the standard substance of Cephalexin monohydrate, and it is applicable for quantitative analysis, quality control, and related research in biochemical experiments. Cephalexin monohydrate (Cephalexin hydrate) is an orally available semi-synthetic cephalosporin antibiotic with significant antimicrobial activity that inhibits bacterial proliferation by targeting penicillin-binding proteins (PBPs).