Drugs Five Years Later

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Abstract
After 5 yr of use, cefazolin can be considered similar to cephalothin as a therapeutic agent and in its potential for adverse reactions. When cefazolin and cephalothin are compared by appropriately designed clinical trials, neither cefazolin''s slightly greater in-vitro susceptibility to staphylococcal .beta.-lactamase inactivation, nor its slightly greater microbiologic activity for some Enterobacteriaceae resulted in any readily apparent therapeutic differences. The important differences between cefazolin and cephalothin, and this is also probably true with respect to cephapirin and cephradine, are not in therapeutic effectiveness, microbiologic activity, or toxicity but rather in pharmacokinetics and cost-effectiveness.
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