No. You start taking them orally at 37 weeks. You can take two twice a day. After you have started an inactive phase of labor, get permission from your doctor to make sure they are OK for you and then insert 2 before bed and take two orally.
Do not do any of this until speaking to your doctor or midwife.
So You just stick them up your vagina?
Vaginally. Once you're 37 weeks you can insert 3-5 a night. I did 3. But I started at 35 weeks with 1 then at 37 went up to 3. They must have helped because castor oil worked at 37+6 and I progressed really fast I was very thin when I went in.