A patient with a severe deep-seated bone infection requires antibiotic therapy and has no known drug allergies. Which medicine is most appropriate?

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Study for the Foundation Year Pharmacy – Clinical Practice Test. Prepare with detailed questions, step-by-step explanations, and test format insights. Enhance your readiness and confidence!

Multiple Choice

A patient with a severe deep-seated bone infection requires antibiotic therapy and has no known drug allergies. Which medicine is most appropriate?

Explanation:
Deep-seated bone infections (osteomyelitis) are most often caused by Staphylococcus aureus, including penicillinase-producing strains. The aim is to use an antibiotic active against MSSA, with good tissue and bone penetration. Flucloxacillin is a penicillinase-resistant penicillin, so it reliably treats MSSA infections and reaches bone well, making it the best choice when there are no drug allergies. Amoxicillin can be inactivated by staph penicillinases, so it’s less reliable for osteomyelitis. Doxycycline can reach bone but isn’t the preferred agent for severe acute osteomyelitis due to variable Staph coverage and overall efficacy in this setting. Ciprofloxacin provides broad coverage and bone penetration but is not ideal as first-line therapy for MSSA osteomyelitis because of resistance concerns and safety considerations in severe bone infections.

Deep-seated bone infections (osteomyelitis) are most often caused by Staphylococcus aureus, including penicillinase-producing strains. The aim is to use an antibiotic active against MSSA, with good tissue and bone penetration. Flucloxacillin is a penicillinase-resistant penicillin, so it reliably treats MSSA infections and reaches bone well, making it the best choice when there are no drug allergies. Amoxicillin can be inactivated by staph penicillinases, so it’s less reliable for osteomyelitis. Doxycycline can reach bone but isn’t the preferred agent for severe acute osteomyelitis due to variable Staph coverage and overall efficacy in this setting. Ciprofloxacin provides broad coverage and bone penetration but is not ideal as first-line therapy for MSSA osteomyelitis because of resistance concerns and safety considerations in severe bone infections.

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