I am 38 weeks n 5 days pregnant i bought a 4oz bottle of castor oil how much am i supose to drink?

Don't bother. I took 2Tb at 39.5 weeks and it did nothing. My aunt is a NP and she said you have to take way more than that to do anything, like drink the whole bottle. So the next night I drank 4oz and about an hour later things started moving. My baby wasn't one of them. My literally vomited for like 3 hours (tmi i know) and not a singe contraction. It was horrible and my son wasn't born for another week (after my doc induced). Castor oil didn't affect my baby in anyway and it didn't cause him to have a bowel movement in utero. Try if you want, but I have yet to find someone who actually went into labor, I will NEVER try it again, I don't care if I want to die at the end of my next pregnancy.