Is UNII-43B2M34G2V Safe in Breastfeeding

I am a breastfeeding mother and i want to know if it is safe to use UNII-43B2M34G2V? Is UNII-43B2M34G2V safe for nursing mother and child? Does UNII-43B2M34G2V extracts into breast milk? Does UNII-43B2M34G2V has any long term or short term side effects on infants? Can UNII-43B2M34G2V influence milk supply or can UNII-43B2M34G2V decrease milk supply in lactating mothers?

Like most penicillin-type antibiotics, excretion into breast milk is clinically non-significant. No harmful effects have been found among breastfed infants from treated mothers. Widely used for treatment of Mastitis since it has an effective activity against Staphylococcus. Be aware of false negative results of microbial cultures done from samples of febrile infants whose mothers are treated with antibiotics. Also, due to imbalance of intestinal flora a diarrheal disease can occur in the breastfed infant. List of Essential Medicines by WHO 2002: compatible with breastfeeding.

UNII-43B2M34G2V (flucloxacillin) is not approved for marketing in the United States by the U.S. Food and Drug Administration. It is acceptable to use during breastfeeding and is frequently used abroad to treat mastitis in nursing mothers.[1][2][3] Limited information indicates that UNII-43B2M34G2V levels in milk are low and are not expected to cause adverse effects in breastfed infants. Occasionally disruption of the infant's gastrointestinal flora, resulting in diarrhea or thrush have been reported with penicillins, but these effects have not been adequately evaluated. UNII-43B2M34G2V is acceptable in nursing mothers.