Dep what you are 'hunting' with it. General shot? I would do max 7 days (one shot) and give my body a break as it's more toxic compared to other anti- parasite drugs. Eggs don't hatch all the time they only hatch when they have their cycle however it does vary parasite to parasite. Probiotic? What for? I see no real need here. But I see no issue with it as well. Reg which fenbendazole you need to take I'm not sure.