Is it safe to take castrol oil 18 days before the do date.

Pregnancy Category X: The x category in pregnancy suggests harmful effect and should not be taken during pregnancy. Nevertheless, you are near due date and so the teratogenic effect is probably dismal. I assume you are planning to use for constipation? There are safer alternative such as mangesium citrate, miralax, (polyethylene glycol) benefiber, metamucil, citrucil etc... Consult doc. Good luck and congratulations.