I have taken lactosec (1 tablet three times a day, for one day) can I continue breastfeeding?

I realize this answer is very later but may help someone later ... Lactosec (Pyridoxine Hydrochloride) is excreted into human milk. Neonatal seizures have been reported in infants whose mothers' breast milk contained 67 mcg/day. These seizures responded to pyridoxine therapy. Pyridoxine is considered compatible with breast-feeding by the American Academy of Pediatrics.

Pyridoxine has been reported to inhibit lactation at large doses. The recommend dietary allowance (RDA) of pyridoxine (vitamin B6) for lactating women is 2 mg/day, regardless of age, to ensure a vitamin B6 concentration of milk of 130 ng/mL.

https://www.drugs.com/pregnancy/pyridoxine.html