Adverse reactions to methicillin and nafcillin during treatment of serious Staphylococcus aureaus infections
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Abstract:
Relative toxicities of methicillin and nafcillin were compared in 70 patients with serious infections caused by Staphylococcus aureus. Of the 29 patients treated with nafcillin, four had fever, rash, and leukopenia and 1 had absolute neutropenia. Of the 41 patients treated with methicillin, 16 experienced 27 reactions. In addition to fever and skin rash, neutropenia and urinary tract abnormalities were common. Methicillin and nafcillin are equally effective in treating S aureus infections, but methicillin was significantly and more frequently associated with adverse drug reaction that was nafcillin.
Insights
Methicillin and nafcillin show equal effectiveness against Staphylococcus aureus infections. However, methicillin is linked to significantly more adverse drug reactions than nafcillin.
Area of Science:
- Infectious Diseases
- Pharmacology
- Clinical Medicine
Background:
- Serious Staphylococcus aureus infections require effective antibiotic treatment.
- Methicillin and nafcillin are commonly used beta-lactam antibiotics for S. aureus infections.
- Understanding the comparative toxicity profiles of these antibiotics is crucial for patient safety.
Purpose of the Study:
- To compare the relative toxicities of methicillin and nafcillin in patients with serious Staphylococcus aureus infections.
- To identify specific adverse drug reactions associated with each antibiotic.
- To inform clinical decision-making regarding antibiotic selection for S. aureus infections.
Main Methods:
- A comparative study involving 70 patients with serious Staphylococcus aureus infections.
- Patients were treated with either methicillin or nafcillin.
- Adverse drug reactions were systematically monitored and recorded for both treatment groups.
Main Results:
- Nafcillin treatment (29 patients) resulted in mild adverse events in some, including fever, rash, and leukopenia.
- Methicillin treatment (41 patients) was associated with a higher incidence of adverse reactions (27 reactions in 16 patients).
- Common adverse reactions with methicillin included fever, skin rash, neutropenia, and urinary tract abnormalities.
Conclusions:
- Methicillin and nafcillin demonstrate comparable efficacy in treating Staphylococcus aureus infections.
- Methicillin is associated with a significantly higher frequency and broader range of adverse drug reactions compared to nafcillin.
- Nafcillin may be a safer alternative to methicillin due to its more favorable toxicity profile.