Carbenicillin is an antibiotic belonging to the carboxypenicillin subgroup of the penicillins. It has gram negative coverage which includes Pseudomonas aeruginosa but limited gram positive coverage. The carboxypenicillins are susceptible to degradation by beta-lactamase enzymes.

is very soluble in water and is acid-labile. Aqueous solutions are short-lived. Working concentration in the lab: up to 100 µg per ml.

It is a semi-synthetic analogue of the naturally occurring penicillin.

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