KLX 141 (Cephalexin Monohydrate 500 mg), Cephalexin is used in the treatment of bladder infection; bacterial infection; bacterial endocarditis prevention; bone infection; kidney infections and belongs to the drug class first generation cephalosporins. Pill Identifier Results for "141 klx". This medication is known as a cephalosporin antibiotic. NDC Code(s): 42043-140-01, 42043-140-05, 42043-141-01, 42043-141-05; Packager:. Find big savings at pharmacies near you with GoodRx discount coupons What pill is green and reads 141 klx? View the logo identification. Cephalexin is the name of the medication.