Final answer:
The expected effect after administering Oxytocin or Pitocin® is uterine contractions during childbirth.
Step-by-step explanation:
Oxytocin and Pitocin® are both hormones that are administered during childbirth to induce or augment labor. The main expected effect of both oxytocin and Pitocin® is uterine contractions. These contractions help to push the baby down towards the cervix and eventually lead to delivery. Other effects can include increased fetal heart rate, but the primary purpose is to stimulate the contraction of the uterine muscles.