Azulfidine (Sulfasalazine) for Pregnant Women Azulfidine is not recommended for use in pregnancy. It does not allow the body to absorb folic acid which is very important for healthy neurological development of your baby. Azulfidine (Sulfasalazine) for Nursing Mothers Azulfidine is not recommended for use in nursing mothers. It passes into breast milk and may cause diarrhea in your baby.