To induce labor pain and delivery, doctors administer oxytocin. The posterior pituitary releases oxytocin in response to the foetal ejection reflex, which is triggered by a fully grown foetus and placenta. At the moment of parturition, oxytocin causes greater uterine contractions (childbirth).
Final Answer:
To induce delivery, doctors inject the hormone oxytocin. It is released from the posterior pituitary gland in the human body.