Cefalonium Chemical formula
Synonyms: 41071; Carbamoylcefaloridine; Cefalonio; Céfalonium; Cephalonium. (7R)-3-(4-Carbamoyl-1-pyridiniomethyl)-7-[2-(2-thienyl)acetamido]-3-cephem-4-carboxylate.
Cyrillic synonym: Цефалоний.

Chemical information

Chemical formula: C20H18N4O5S2 = 458.5.
CAS — 5575-21-3.
ATC Vet — QJ51DA90.


BP(Vet) includes the dihydrate.

BP(Vet) 2008

(Cefalonium). The dihydrate is a white or almost white crystalline powder. Very slightly soluble in water and in methyl alcohol; insoluble in alcohol, in dichloromethane, and in ether; soluble in dimethyl sulfoxide. It dissolves in dilute acids and in alkaline solutions. Store at temperature not exceeding 30°. Protect from light.


Cefalonium is a cephalosporin antibacterial used in veterinary practice.
Published December 16, 2018.