Can someone please explain why taking the "midwives brew" to induce labor (castor oil) is dangerous?

I will be 40 weeks tomorrow and would like to know what are the risks? Online I mostly found that it was cause dehydration and diarrhea but am I missing something else? Those to me do not sound as horrible as people make it seem, but if you have more info on why it's dangerous or any bad experience you had with drinking it PLEASE comment! I'd appreciate any info. I want to be educated about this but haven't found much online.

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