Is "Leng Yang" (the Chinese herbal drink) safe for breastfeeding?

Ling Yang or Antelope's Horn is very cooling isn't it? I remember a colleague recommending that I should drink some after a bout of viral fever. Like everything else, i reckon that it is best to take it in moderation especially when breastfeeding or pregnancy is involved. When you are at the medical hall purchasing these herbs, always check with the experts if it is suitable for you and baby.