Can you take Alvimopan while pregnant?
Last updated September 7, 2026.
Alvimopan is not a medicine you start on your own while pregnant, because it is given only in the hospital for a few days after bowel surgery, and only when your surgical and prenatal teams agree the benefit is worth it. The drug acts mainly in the gut and blocks opioid effects on the bowel, which can shorten the time until you pass gas and eat again after a bowel resection. Human pregnancy data are limited, so the decision rests on how much you need the surgery and how much the recovery benefit matters for you. It is supplied only to hospitals and is capped at 15 doses over no more than 7 days, so there is no home supply to manage. Alvimopan is not used for everyday constipation or for opioid side effects outside that surgical setting. If you are pregnant or think you might be, say so to the surgical team and your prenatal clinician before the operation is scheduled.
What to do
- State the pregnancy up front: Tell the surgeon, the anesthesia team, and the nurses how many weeks along you are before surgery is booked.
- Ask why it is being used: Ask what the medicine is meant to speed up in your recovery and what the plan is if you skip it.
- Expect a short hospital course: Doses stop when you leave the hospital, and there is no prescription to continue at home.
- Do not source it yourself: Any alvimopan offered outside a hospital is not legitimate, so decline it and tell your clinician.
- Keep your prenatal team in the loop: Ask that your obstetric clinician be contacted about the surgery and every medicine used around it.
- Report changes during recovery: Tell staff right away about belly pain that worsens, vomiting, bleeding, or reduced fetal movement.
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