<p>Pregnancy Category D. There are no adequate and well-controlled studies with Eribulin Mesylate in pregnant women. It is not known whether Eribulin Mesylate is excreted into human milk. No studies in humans or animals were conducted to determine if Eribulin Mesylate is excreted into milk. Because many drugs are excreted into human milk and because of the potential for serious adverse reactions in human milk-fed infants from Eribulin Mesylate, a decision should be made whether to discontinue nursing or to discontinue Eribulin Mesylate taking into account the importance of the drug to the mother.</p>