It is not safe when you are breast feeding. It is not good drug . This highly toxic and does
kidney damage. I don't give at all. Root canal is not that painful. You don't require strong drugs. Maximum take paracetamol and some antibiotics if necessary.
Next Steps
You are quite intelligent to find out and ask .
Health Tips
To continue breast feeding. Breast feedind is made for babies, It is best to feed the baby. Continue brest feeding, even later in life it prevents so many diseases if breast fed now.