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The past 50 years have seen the use of the classic mu opioid agonist morphine and other opioids diminish markedly for several reasons, including availability of epidural anesthetics, side effects, formulary restrictions, and concern for neonatal respiratory depression. Morphine is now primarily used in obstetrics to provide rest and sedation as appropriate for the stressed prodromal stages of a labor without sufficient cervical dilatation. 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