The name benzylpenicillin is commonly used to describe either benzylpenicillin potassium or benzylpenicillin sodium as these are the forms in which benzylpenicillin is used. Benzylpenicillin means either the potassium or sodium salt. The potassium salt of a substance produced by growing certain strains of Penicillium notatum or related organisms or obtained by any other means. A white or almost white crystalline powder.
Antibacterial drugs
Generic Principen (Ampicillin)
Ampicillin is a beta-lactam antibiotic. It is bactericidal and has a similar mode of action to that of benzylpenicillin, but as an aminopenicillin with an amino group side-chain attached to the basic penicillin structure, ampicillin is better able to penetrate the outer membrane of some Gram-negative bacteria and has a broader spectrum of activity.