penicillins , including derivatives of 6-aminopenicillanic acid , are rapidly excreted , reabsorbed and re-excreted , in high concentration , whereas streptomycin , neomycin , paramomycin and chloramphenicol reach lower levels in the bile than in the plasma . p-aminobenzylpenicillin and d ( - ) -6- ( alpha-amino-alpha-phenylacetamido ) penicillanic acid , both of which are bactericidal to salmonellae and other coliforms , produce higher concentrations in the bile than benzylpenicillin ( penicillin g ) .
C0002680
aminobenzylpenicillin
C0030827
penicillin g