It is a non-depolarizing muscle relaxant drug with a peripheral action that is used as premedication for endotracheal intubation, general anesthesia and mechanical ventilation. Breastfed infants have not shown any problem after 1.5 to 5 hours of anesthesia time period with Rocuronio (additional drugs like Propofol, Remifentanil and Xenon were used). A high molecular weight may decrease excretion into breast milk as well as a rapid elimination time. In addition, a low oral bioavailability makes unlikely a pass from ingested mother's milk onto the infant's plasma. Rocuronium should not prevent a mother from breast feeding her baby shortly after recovering from an anesthesia if she is in good condition.