Cefalexin also called Cephacillin or Cephalexin. As a semi-synthetic(50%- synthetic) cephalosporin type antibiotic, Cefalexin Monohydrate has remarkable anti-microbial ability. This is is similar to that of cephaloridine or cephalothin, only difference is that Cefalexin Monohydrate is somewhat less potent.Cefalexin Monohydrate will target a wide range of gram-positive and gram-negative organisms.