Have been pregnant twice and taken it twice and yes it worked for me.
I also know about 8 castor oil kids!
1st time i took entire bottle, mixed with fresh oj and downed it. The need to not be induced and get the baby out was stronger than the desire to be sick. It was fine. Took it at 7.30pm and had first contraction at 9.50pm, had baby 6 hours later. HAd 1 big clear out on the loo, no problems.
Baby no 2, I wasn't late but was desperate not to have baby on Xmas Day so took 1/2 a bottle in the am. Bit of toileting occored but then nothing. So before I went to bed I took the 2nd half. Had proper evacuation of the bowels and was quite unplesant. However I went to bed and woke up at 2am and had baby 4 hours later, no problems.
Would I do it again, yes, over being induced, any day. Would rather go into natural labour with an empty bowel then be induced anyday of the week. Am hoping this time I won;t have to and that I'll discover what it's like to go into labour with taking castor oil.
Good luck
PS - have you tried everythig else, sex, pinapple, nipple tweaking, clary sage in bath etc etc?