Study Shows Supplement Reverses Some Prenatal Opioid Harm in Rats

Babies exposed to opioids before birth in an Australian study showed lasting memory and behavioral problems. Those problems disappeared when researchers added a common gut bacteria supplement to their diet.

The finding was published in Translational Psychiatry and reported by the European Animal Research Association on May 18, 2026. The study is preliminary and was conducted in rats.

It raises a hopeful question. Could some of the harm from prenatal opioid exposure one day be softened with a simple inexpensive treatment?

“It was remarkable” said Hanaia Nkash a postdoctoral researcher at the University of New South Wales who led the work. “Within weeks the deficits in memory and behaviour were gone. They did not come back.”

What the Researchers Did

Opioids during pregnancy can affect the developing fetus in ways that last beyond birth. This includes prescribed medications such as methadone and buprenorphine which are used to treat addiction.

In humans, prenatal opioid exposure has been linked to attention deficits, memory difficulties and impulsivity later in childhood. The drugs are also known to affect how brain cells wire together.

Nkash’s team exposed pregnant rats to morphine, a potent opioid for ten days.

These effects were linked to changes in the animals’ gut microbiome, which is the community of bacteria living in the digestive tract. It is known to communicate with the brain.

The researchers then gave the young rats sodium butyrate. It is a short-chain fatty acid produced by gut bacteria when they digest fiber.

Butyrate is available as a dietary supplement. It is also known to cross into the brain and promote cell repair.

After several weeks of supplementation the behavioral deficits were gone. They did not return.

What This Means for Pregnancy and Opioid Treatment

The study highlights a difficult issue for pregnant people with opioid use disorder.

Untreated opioid use during pregnancy carries serious risks. These include overdose preterm birth and poor prenatal care.

The standard of care is not to stop opioids abruptly because doing so can cause serious complications including miscarriage.

Instead the goal is to stabilize the parent with methadone or buprenorphine throughout pregnancy and delivery, which protects both parent and baby. Decades of evidence support it.

At the same time both medications are opioids. Infants exposed to them before birth can experience neonatal abstinence syndrome.

Neonatal abstinence syndrome is the withdrawal period that some newborns experience after prenatal opioid exposure.

Hospitals manage this withdrawal carefully. In some cases babies receive small doses of morphine. The condition usually resolves with appropriate medical care.

What has been less clear is whether subtler effects on brain development can persist into childhood. Researchers also want to know whether anything can be done to reduce those effects.

The rat study suggests a possible future avenue. If a cheap widely available supplement can reverse some of those effects it could eventually complement current care.

The researchers emphasize that methadone and buprenorphine remain essential for treating pregnant people.

Why Detox.com Readers Should Read This Carefully

Two cautions are especially important. This was a study in rats and not a study in people.

Animal research often fails to translate directly to humans so no parent should start a child on any supplement based on this finding.

Clinical trials in people would need to happen first, and researchers themselves are calling for that research.

Additionally this is not a detox or withdrawal treatment. Sodium butyrate did not treat opioid dependence or withdrawal in the study, it addressed developmental effects in offspring after opioid exposure.

For pregnant people the takeaway is unchanged. Abruptly stopping opioids during pregnancy is dangerous. Medically supervised stabilization with methadone or buprenorphine remains the evidence-based approach.

Prenatal care is also important. So is planning for the newborn’s possible withdrawal needs.

Babies born to parents receiving medication for opioid use disorder generally do better than babies born to parents whose addiction goes untreated.

Neonatal Withdrawal Is Manageable With Medical Care

When a newborn experiences withdrawal after prenatal opioid exposure hospitals provide supportive care. Medication may also be used when necessary.

The baby is closely monitored throughout the process. This is a form of medical detox tailored to newborns. It is routine in hospitals across the country.

Parents may fear that their baby will suffer if they stay on methadone or buprenorphine. It is important to understand that managed supervised withdrawal in a hospital is very different from untreated withdrawal.

Care for these babies has also improved as treatment practices have become more standardized. For adults considering detox from opioids the same principle applies.

Withdrawal managed with medications such as buprenorphine or methadone is safer and more comfortable than stopping cold turkey. It also keeps the door open to ongoing treatment.

Search detox.com’s directory to locate a local detox center where you can begin your recovery or call 800-996-6135Sponsored to speak with a treatment specialist.