Probiotics Before Surgery and in Acute Pancreatitis: Trial Warnings

Urgent first

A severe stomach ache that came on suddenly needs urgent medical attention, according to the NHS; in the US, call 911 in an emergency. [1] If you are in hospital with pancreatitis, or have surgery planned, do not start or stop a probiotic on your own. Tell the surgical or hospital team about every supplement you use: the NCCIH notes that supplements may pose risks if you have certain medical problems or are going to have surgery. [2] Information only; this page cannot tell you what is right for you.

The short answer

In one large trial of people with predicted severe acute pancreatitis, a particular multispecies probiotic preparation did not prevent infections and was linked to more deaths. [3] Later reviews found no clear benefit in severe pancreatitis. [4][5] In planned bowel surgery, reviews of hospital trials found fewer infections with probiotics or synbiotics, but the evidence is rated low-certainty and the authors call for more work. [6][7] A result in one setting does not transfer to a shop-bought product, a different strain or a different illness.

Evidence labels used here: evidence of harm (in one trial, for one preparation), mixed, promising but limited, insufficient evidence, and Proper evidence not found.

Acute pancreatitis: the PROPATRIA trial

A multicenter, double-blind, placebo-controlled trial (known as PROPATRIA [8]) enrolled 298 people with predicted severe acute pancreatitis. They received a multispecies probiotic preparation or placebo, given enterally (into the gut) twice daily for 28 days, starting within 72 hours of symptoms. [3]

The authors concluded that this combination of strains did not reduce infectious complications, was associated with higher mortality, and should not be given to this category of patients. [3] A study of the same trial's patients found the probiotic was linked with signs of more gut-cell damage in people who developed organ failure. [8] PubMed also lists a 2010 Lancet "expression of concern" about the trial; we did not read its text. [9]

What other studies add:

• A smaller trial in 50 people with acute pancreatitis was stopped early after the PROPATRIA results and was underpowered; it saw no difference in gut permeability or mortality. [10]


• A 2023 meta-analysis of 6 randomized trials of probiotics with early tube feeding in severe pancreatitis found no significant effect on mortality or organ failure, but a shorter hospital stay (a weighted difference of about 5.5 days, with a wide range of uncertainty). [4]


• Another 2023 meta-analysis of 7 trials found no significant difference in death, organ failure, septicaemia or infected necrosis. [5]


• A 2026 review of 25 meta-analysed studies reported a safety signal from the large trial, and concluded current evidence does not support routine use, particularly of live probiotics in severe or critically ill patients. [11]

Proper evidence not found: we looked for a recommendation about probiotics in the abstract of the American College of Gastroenterology's 2024 acute pancreatitis guideline and it does not mention them. [12] We did not read the full guideline text.

Before and after surgery

Reviews of randomized trials in colorectal surgery are more encouraging, with limits:

These trials used specific products and schedules under hospital supervision. A 2014 safety review named postoperative and hospitalized patients among the groups most at risk of serious adverse effects such as sepsis and fungemia. [13] So a result in one hospital protocol should not be read as "probiotics are fine before surgery". Reviews of other kinds of operations were not read for this page, so we say Proper evidence not found for them.

Who needs extra care

Hospitalized people, those with central lines or weakened immunity, and premature infants: see probiotics and bloodstream infection. The FDA warns that preterm infants given probiotics are at risk of invasive, potentially fatal disease. [14] For medicines, including those used after transplant or cancer treatment, see probiotics and medicine interactions and medication interactions. For general supplement rules before an operation see supplements before surgery. A surgeon, anesthesiologist or pharmacist can say whether a probiotic fits your situation.