Pain management in pregnancy and lactation

Avoid NSAIDs from 20 weeks, continue medication for opioid use disorder rather than tapering, support breastfeeding in stable patients on methadone or buprenorphine, and treat disabling postdural puncture headache with an epidural blood patch.

1. NSAIDs and the 20-week rule. FDA advises avoiding NSAIDs at 20 weeks or later because fetal kidney dysfunction can cause oligohydramnios; if needed from 20 to 30 weeks, use the lowest dose for the shortest time ¹.
2. The ductus adds a later risk. From about 30 weeks, NSAIDs can also close the fetal ductus arteriosus prematurely; the warning does not cover low-dose (81 mg) aspirin for obstetric indications ¹.
3. Treat opioid use disorder with medication. For pregnant patients with opioid use disorder, buprenorphine or methadone is recommended and preferred over withdrawal management, offered as early as possible; medically supervised withdrawal is not recommended because return to use is common ²³.
4. Lowering the dose does not spare the newborn. Neonatal abstinence syndrome severity does not correlate with maternal methadone or buprenorphine dose ³.
5. Encourage breastfeeding when stable. Women stable on buprenorphine, buprenorphine/naloxone or methadone should be advised to breastfeed if appropriate ³. Codeine and tramadol are different: their FDA labels advise against breastfeeding during treatment ⁷⁸.
6. Blood patch for disabling postdural puncture headache. When headache resists conservative care and impairs daily activities, an epidural blood patch should be considered and not delayed without contraindications ⁴⁵.

Tapering opioids in pregnancy risks withdrawal harm to both the pregnant patient and the fetus; obtain appropriate expertise before any taper, and for opioid use disorder offer medication rather than withdrawal management ².

• Consider ultrasound monitoring of amniotic fluid if an NSAID is used beyond 48 hours after 20 weeks ¹.
• Methadone metabolism accelerates in the third trimester; split dosing can help maintain levels ³.
• Infants with long-term opioid exposure should be observed at least 72 hours; 5–7 days after methadone exposure ².
• FDA labels: breastfeeding is not recommended with codeine or tramadol; ultra-rapid CYP2D6 metabolizers can pass dangerous morphine or M1 levels into milk ⁷⁸.
• No prophylactic measure, including prophylactic blood patch or bed rest, is routinely recommended after dural puncture ⁵.
• Multimodal analgesia with acetaminophen and NSAIDs should be offered to all patients with postdural puncture headache unless contraindicated ⁵.
• Early universal screening, brief intervention and referral for opioid use disorder in pregnancy improve maternal and infant outcomes ².
• ACOG advises monitoring opioid-exposed newborns for neonatal abstinence syndrome by a pediatric provider ⁶.

• Tapering methadone to protect the newborn from withdrawal ³.
• Using the old 30-week NSAID cutoff ¹.
• Advising a patient stable on buprenorphine not to breastfeed ³.
• Treating sphenopalatine ganglion or occipital nerve blocks as proven; both still need more robust evidence for postdural puncture headache ⁵.