probiotics
7 interactions related to probiotics
antibiotics + probiotics
Taken at the same moment, an antibiotic can kill bacterial probiotic organisms before they reach the gut, lowering the probiotic's benefit. Spacing the doses apart fixes it.
probiotics + prebiotics
Prebiotics are non-digestible fibers (like inulin, FOS, and GOS) that some gut bacteria ferment for fuel. Pairing them with a probiotic creates what scientists call a 'synbiotic.' The pairing is plausible and generally well tolerated, but evidence that the combination clearly beats either ingredient on its own is mixed and depends on the condition and the specific strains used.
probiotics + vitamin d
Vitamin D and probiotics act on overlapping pathways in the gut. Vitamin D supports vitamin D receptor (VDR) activity in the intestinal lining, which probiotics rely on for their anti-inflammatory and barrier-strengthening effects, while some probiotic strains appear to modestly raise circulating vitamin D. Randomized trials suggest combined supplementation can outperform either alone for some inflammatory and gut-barrier endpoints, though the evidence base is still limited.
yogurt + antibiotics
The calcium in yogurt can bind to certain antibiotics — specifically the tetracyclines and fluoroquinolones — in the gut and reduce how much of the drug is absorbed. This is the same chelation interaction seen with milk. Penicillins and macrolides are not meaningfully affected. The fix is timing: take these antibiotics with water and keep yogurt and other calcium-rich foods a couple of hours apart from the dose.
probiotics + immunosuppressants
In people whose immune systems are pharmacologically suppressed (for example by calcineurin inhibitors, mTOR inhibitors, corticosteroids, or mycophenolate), live probiotic organisms can occasionally cross the gut wall and enter the bloodstream, causing bacteremia, endocarditis, or sepsis. Case reports and a matched case-control study document Lactobacillus and Bifidobacterium bloodstream infections in transplant and oncology patients, with some strains naturally resistant to first-line antibiotics. The event is uncommon but serious.
probiotics + antifungals
Systemic antifungals (such as fluconazole, itraconazole, amphotericin B, and the echinocandins) can kill yeast-based probiotics such as Saccharomyces boulardii, blunting their benefit. Bacterial probiotics like Lactobacillus and Bifidobacterium are generally unaffected, because their cell structure differs from fungi.
probiotics + chemotherapy
Chemotherapy can lower infection-fighting white blood cells and damage the gut lining, allowing live organisms from probiotic supplements to cross into the bloodstream and cause serious infection.