Which of the following medications is classified as an antipseudomonal penicillin?

Explanation

Among the listed drugs, piperacillin is known for its activity against Pseudomonas aeruginosa, classifying it as an antipseudomonal penicillin. Cephalexin is a first-generation cephalosporin, cloxacillin and dicloxacillin are penicillinase-resistant penicillins, but they do not have antipseudomonal properties.