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In page Prostaglandin E2:

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Common side effects include vomiting, fever, diarrhea, and excessive uterine contraction.[1] In babies there may be decreased breathing and low blood pressure.[2] Care should be taken in people with asthma or glaucoma and it is not recommended in those who have had a prior C-section.[4] Prostaglandin E2 is in the oxytocics family of medications. It works by binding and activating the prostaglandin E2 receptor which results in the opening and softening of the cervix and dilation of blood vessels.[1][2]