saudigastro.com/patients/probiotics
This article is educational and does not replace your doctor's advice. Seek urgent care for any red-flag symptoms.
Drug class
Live microorganism supplements (usually sold as dietary supplements or foods)
Examples
Products containing Lactobacillus, Bifidobacterium or the yeast Saccharomyces boulardii; fermented foods such as yoghurt or laban
How it works
The gut is home to trillions of microbes, called the microbiome. Probiotics are live microbes that may help balance this community, support the gut lining and calm the immune system. Their effects depend on the exact strain and product, so a result seen with one product does not apply to others.
What it treats
- Some people use them to help prevent diarrhoea linked to antibiotics; benefit depends on the product
- Short-term relief of some bloating or gas in irritable bowel syndrome for a few people; evidence is mixed
- Pouchitis (inflammation of the surgically made pouch after colectomy), under specialist care
- Some infant and child conditions only when a paediatrician recommends a specific product
- For many other conditions, including Crohn’s disease, ulcerative colitis and general “gut health”, evidence is limited or unclear
How to take it
Probiotics are not a replacement for medicines your doctor has prescribed. If you want to try one, talk to your doctor or pharmacist first, choose a product with the strain(s) named on the label, follow the label instructions, and try it for a limited period (for example a few weeks) to see if it really helps; stop if it does not. Keep to the storage instructions, because some need refrigeration. Dietary sources such as yoghurt or laban with live cultures are a reasonable option for most healthy people.
Common side effects
- Gas, bloating or mild stomach discomfort, especially in the first days
- Loose stools in some people
- Mild thirst or nausea
Serious side effects — call your doctor
Fever, chills or feeling very unwell while taking a probiotic, especially if you have a weakened immune system, a central line, or are very ill
Rarely, live microbes can enter the blood and cause a serious infection. Stop the product and seek urgent medical care.
Rash, itching or swelling of the lips or throat
Could be an allergic reaction (some products contain milk, soy or other ingredients). Stop it; if there is swelling or breathing trouble, call emergency services now.
Severe belly pain, bloody diarrhoea, or symptoms that keep getting worse
These are not caused by probiotics alone and need medical review. Seek care promptly, and urgently if severe.
A baby, especially a premature or very sick baby, who seems unwell after being given a probiotic
Do not give probiotics to premature or very ill babies unless their doctor prescribes them. If a baby is unwell, feverish, not feeding or very drowsy, take them to the emergency department immediately.
Interactions
Probiotics can be affected by antibiotics taken at the same time; ask your pharmacist about spacing. People who take immune-lowering medicines (steroids, azathioprine, biologics), have had transplants, have severe illness, a central line or severe pancreatitis should only use probiotics if their specialist agrees. Products are often regulated as supplements, and the content may vary between brands, so ask your pharmacist to help you choose.
Monitoring
There is no routine monitoring. Keep a simple note of your symptoms before and after you start so you and your doctor can judge whether it is really helping.
When and how to stop
Stop if you notice no benefit after a reasonable trial, if symptoms get worse, or if any red-flag symptom appears. Do not use a probiotic instead of a prescribed treatment, and tell your doctor if you take one.
Pregnancy & breastfeeding
Probiotic foods are generally fine in pregnancy and breastfeeding for most women, but ask your doctor before taking probiotic supplements, particularly if you have other health conditions.
In the Saudi context
Fermented dairy such as laban and yoghurt are part of the local diet; choose unsweetened, pasteurised types from trusted sources.
Questions to ask your doctor
Save this list or print it before your appointment — doctors appreciate prepared patients.
- Is there any evidence that a probiotic would help in my condition?
- Is it safe for me, given my medicines and immune system?
- Which product, if any, should I choose, and for how long?
- Can I get the same benefit from food?
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Status: Approved for publication by SGA; individual clinician review is ongoing · Published 24/04/2026
For general education only; it does not replace your doctor’s advice. Individual clinician review of this guide is ongoing. SGA clinician? Review this guide