<unk>  is a bactericidal antibiotic belonging to the carboxypenicillin subgroup of the penicillins. It was discovered by scientists at Beecham and marketed as Pyopen. It has Gram-negative coverage which includes Pseudomonas aeruginosa but limited Gram-positive coverage. The carboxypenicillins are susceptible to degradation by beta-lactamase enzymes, although they are more resistant than ampicillin to degradation.<unk>  is also more stable at lower pH than ampicillin.
Carbenicillin
Penicillin
Piperacillin
Extended-spectrum penicillin
Methicillin
Ampicillin
Tetracycline
Cefazolin