Umm, i have no idea for a pregnant female however i did find this on the first couple of searches - It is not known whether ivermectin will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant while using this medication. Ivermectin can pass into breast milk and may harm a nursing baby. Tell your doctor if you are breast-feeding a baby. It would seem there may be some 'possibility of potential' for risk - but it appears 'low' as contradictions are usually allergenic reactions. I usually do a harkers herbals brand elixir intestinal (parasite) cleanse (once/twice a year) - tastes like ass tho (wormwood, green walnut leaf, clove oil etc plus some other essential oils and herbs).