<p>Pregnancy Category B. There are, however, no adequate and well-controlled trials in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed. Ertapenem is excreted in human breast milk. Caution should be exercised when Ertapenem is administered to a nursing woman. Ertapenem should be administered to nursing mothers only when the expected benefit outweighs the risk.</p>