Evaluation of the effect of castor oil on initiating labor in term pregnancy

Saudi Med J. 2006 Jul;27(7):1011-4.


Objective: To determine the effect of castor oil on initiating labor in term pregnant women.

Methods: We conducted this randomized control clinical trial on 47 pregnant women from August 2003 to March 2004 in Mashhad University of Medical Sciences, Iran.

Results: There was a significant increase in labor initiation ratio in the castor oil group compared with the control group (54.2% compared with 4.3%, p<0.001). Also, the mean bishop score in the castor oil group increased from 2.50 +/- 1.29 to 6.79 +/- 3.20 (p<0.001).

Conclusion: The probability of labor initiation increases during the first 24 hours after using castor oil, however, further studies are recommended to improve its efficacy and safety.

Publication types

  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Administration, Oral
  • Adult
  • Castor Oil / administration & dosage
  • Castor Oil / pharmacology*
  • Female
  • Humans
  • Iran
  • Labor Onset / drug effects*
  • Labor, Obstetric / drug effects*
  • Pregnancy
  • Pregnancy Outcome


  • Castor Oil