No information is available about the use of pentazocine during breastfeeding. Of being necessary the use of a narcotic analgesic, you should use a well-documented substance.
If the mother has received pentazocine during labor or immediately postpartum, the infant should be monitored for signs of neurological or cardiorespiratory depression or significant changes in the pattern of feeding or sleep.
Warning of the manufacturer:
The manufacturer recommends a preliminary assessment by the doctor before taking the medication while breastfeeding.