Final answer:
Certain penicillin-based antibiotics can provide gram negative coverage with pseudomonas. Fluoroquinolones, polymyxin B, and gentamicin are also effective.
Step-by-step explanation:
Gram negative coverage with pseudomonas can be achieved using certain penicillin-based antibiotics. Pseudomonas spp. have a tendency to be resistant to many antibiotics, but some penicillin-based antibiotics can still be effective. Fluoroquinolones, polymyxin B, and gentamicin are also effective against pseudomonas.