Question #7 explained
What organism are the penicillinase-resistant penicillins (e.g., oxacillin, dicloxacillin) commonly used to treat?
NOTE: The acronym “CONDOM” is used to help remember this group of drugs: cloxacillin, oxacillin, nafcillin, dicloxacillin, oxacillin, methicillin. The other name for the penicillinase-resistant penicillins is the anti-Staphylococcal penicillins. This is not an acronym to use on rounds, but is helpful for remembering these drugs.
A. E. coli – INCORRECT: these drugs lack Gram negative activity
B. Methicillin-sensitive Staphylococcus aureus (MSSA) – CORRECT: these drugs are almost exclusively used for MSSA
C. Haemophilus influenzae – INCORRECT: these drugs lack Gram negative activity
D. Streptococcus agalactiae – INCORRECT: while they may be active against this Gram positive organism, it is very uncommon to use a penicillinase-resistant penicillin for this organism