Black cohosh may be safe at recommended doses, but possible side effects include liver damage and autoimmune hepatitis.Reported direct side-effects also include dizziness, headaches, and seizures,diarrhoea,nausea and vomiting; sweating; constipation; low blood pressure and slow heartbeats; and weight problems.
Besides ther are certain other methods available for induction of labour which are tried and tested and safe. Your Gynaecologist can do the needful.