Castor oil has been used for many years to induce labor. Many women, doctors, and midwives swear by castor oil as a way to induce labor. Other mothers have tried castor oil will no success. Unfortunately almost all have experienced the side effects which may be very unpleasant. Potential side effects include diarrhea, nausea, vomiting, dehydration (from loose stools and/or vomiting), fetal distress, and meconium in the baby.
Castor oil is a laxative. It is believed that castor oil works to stimulate the bowels. There are reports of having the baby within hours of a castor oil induction or the induction taking days, if it does work. Limited medical studies indicate that there is data to suggest that labor may be more likely in the first day after ingesting castor oil.
Typically mothers spend a lot of time in the bathroom with diarrhea before noticing contractions. Then contractions kick in, if they are going to do so, though these contractions may not progress to full blown labor. This can be seen as a type of cervical ripening agent, even if labor does not immediately follow.
Castor oil has an unpleasant taste, but there are a variety of recipes available to make the ingestion more palatable. Common concoctions take the form of smoothies.
Many practitioners do not recommend castor oil because of these potential side effects. It is always wise to talk to your midwife or doctor about how to use castor oil before doing so.