Is UNII-Q461L7AK4R Safe in Breastfeeding

I am a breastfeeding mother and i want to know if it is safe to use UNII-Q461L7AK4R? Is UNII-Q461L7AK4R safe for nursing mother and child? Does UNII-Q461L7AK4R extracts into breast milk? Does UNII-Q461L7AK4R has any long term or short term side effects on infants? Can UNII-Q461L7AK4R influence milk supply or can UNII-Q461L7AK4R decrease milk supply in lactating mothers?

Information in this record refers to the use of UNII-Q461L7AK4R (I 131 meta-iodobenzylguanidine; I 131 MIBG) as a diagnostic agent. The International Commission on Radiological Protection states that breastfeeding should be interrupted for more than 3 weeks following diagnostic use of I 131 MIBG. After therapeutic dosages, the manufacturer recommends that breastfeeding should be withheld for 80 days after the final dose. These times usually result in permanent discontinuation of breastfeeding for this infant, and cessation of breastfeeding for the current infant is recommended by most experts.[1][2] Patients receiving UNII-Q461L7AK4Rusually receive potassium iodide prior to the diagnostic examination to block their thyroid gland's uptake of the I-131 that is released from the I 131 MIBG. Iodide may interfere with the infant's thyroid function. Nursing mothers should not work with substances containing I 131 in their workplace.[3]