Which of the following doesn't have any effect on pseudomonas?: (A) Ticaracillin, (B) Carbenicillin, (C) Azlocillin, (D) Naficillin
Answer is D. Nafcillin is a narrow-spectrum bactericidal antibiotic agent of the penicillin class. It is useful for susceptible infections due to penicillinase-producing staphylococci. Piperacillin and Mezlocillin also acts on pseudomonas.