Is it safe to take castor oil to induce labor?

Depends... Castor oil is a great way to have a bowel movement. if you are close to entering labor on your own, the cramping from your colon may stir up contractions in the uterus and labor will go from there. IF you are NOT ready to labor, you will have painful cramping and diarrhea, some uterine cramps but not any cervical dilation and you will still be pregnant after it all settles down.