Clinical trial Recruiting at 9 sites Phase 4 Interventional Ages 18 and up Women only

Spinal morphine to reduce pain after planned caesarean section

Official title: MOTHER Trial: Efficacy and Safety of Low-dose Intrathecal Morphine Following Planned Caesarean Section - a Randomised, Blinded, Clinical, Controlled, Multicentre Trial.

Run by Zealand University Hospital · NCT06797973 · Data updated 2026-11-12

This trial will test whether adding a small dose of morphine to spinal anesthesia helps women having planned caesarean sections have less pain afterward without harming mother or baby.

Quick facts

PhasePhase 4
Study typeInterventional
Ages18 Years and up
SexWomen only
Enrollment1312 (estimated)
SponsorZealand University Hospital
Academic / other
Locations9 sites (Aarhus and 8 other locations)
StatusRecruiting
StartedJuly 15, 2025
Main results expectedMay 31, 2027
Study endsJune 30, 2027
Registry record updatedSeptember 11, 2026
Trial IDNCT06797973 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adult women (≥18 years) with a singleton pregnancy scheduled for a planned caesarean under spinal anesthesia who can read Danish and give informed consent.

Probably not a fit

Patients planned for combined spinal‑epidural or a postoperative epidural, those with allergy or contraindication to morphine, and those unable to read Danish (including many emergency cesarean cases) are unlikely to be eligible or to benefit from this intervention.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This is a pragmatic, randomized, double-blind, placebo-controlled multicenter trial comparing low-dose (80 µg) intrathecal morphine versus saline added to standard spinal anesthesia for planned caesarean section. All participants receive standard multimodal postoperative analgesia and may use oral morphine as needed, while researchers collect pain scores, side-effect questionnaires, and maternal and neonatal safety data from medical records and surveys. Co-primary outcomes are postoperative pain (numeric rating scale) and a composite maternal-neonatal safety outcome, with a planned enrollment of 1,312 participants to detect clinically relevant differences. The trial is investigator-initiated and designed to provide pragmatic evidence about the balance of benefits and harms of adding intrathecal morphine.

Why it matters

Potential benefit: If successful, adding low-dose intrathecal morphine could reduce early postoperative pain and opioid use after caesarean, speeding recovery and supporting mother–infant bonding.

How similar studies have gone: Previous smaller trials and routine clinical use suggest intrathecal morphine gives up to 24 hours of improved analgesia after caesarean, but high-quality large randomized evidence on low-dose protocols and safety trade-offs is still limited.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Patients ≥ 18 years
* Singleton pregnancy
* Scheduled for planned caesarean section performed under spinal anaesthesia
* Written informed consent

Exclusion Criteria:

* Allergy to or contraindications towards trial medication
* Patients planned for postoperative epidural due to expected difficult postoperative pain management
* Patients planned for combined spinal-epidural as primary anaesthesia
* Inability to understand and read Danish
* Previous inclusion in the trial

Where it's running

  • Aarhus University Hospital
    Aarhus, Denmark
    Recruiting
  • Copenhagen University Hospital - Rigshospitalet
    Copenhagen, Denmark
    Recruiting
  • Copenhagen University Hospital - Herlev and Gentofte, Herlev
    Herlev, Denmark
    Recruiting
  • Copenhagen University Hospital - North Zealand, Hillerød
    Hillerød, Denmark
    Recruiting
  • Regional Hospital Horsens
    Horsens, Denmark
    Recruiting
  • Copenhagen University Hospital - Amager and Hvidovre, Hvidovre
    Hvidovre, Denmark
    Recruiting
Show 3 more locations
  • University Hospital of Southern Denmark - Lillebælt Hospital, Kolding
    Kolding, Denmark
    Recruiting
  • University Hospital of Southern Denmark - Odense University Hospital
    Odense C, Denmark
    Recruiting
  • Zealand University Hospital
    Roskilde, Denmark
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.