Similar class : Both are similar in way they attack bacteria. Overall Augmentin (amoxicillin and clavulanate) is more effective for sinus infections. Omnicef is not used too often anymore for sinus infections and this is supported by the Infectious Disease Society of America. may get more Belly issues on both together. If sinus infection persists with Augmentin (amoxicillin and clavulanate) it needs another antibiotic or no antibiotic as a virus/mold/pollution is cause
Answered 8/24/2017
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