Iberogast: what it is, dosage, side effects and alternatives

Yesterday a customer asked me about Iberogast. She had been struggling for months with bloating after meals, that balloon feeling in the stomach that does not shift with herbal teas or patience. Her gastroenterologist had recommended it and she wanted to know if it really worked or if it was "just another one". I understand that completely.

In my pharmacy I get that question every week. Sometimes two or three times.

Iberogast does not fit neatly into the usual "digestive medicines" box: it is not an antacid or a stomach protector. It is a combination of nine medicinal plants that act on several digestive mechanisms at the same time, with decades of clinical studies behind it. Let's go through it calmly.

What is Iberogast and which medicinal plants it contains

Iberogast is a herbal medicinal product developed by Bayer Consumer Health that contains extracts of nine medicinal plants in oral drop form. Its technical name is STW 5 and it has been on the European market for more than 50 years. It is not a simple health shop product: it is a registered medicine, with controlled clinical trials.

The nine plants are:

• Iberis amara (bitter candytuft): the key plant, helps regulate gastric motility.
• Matricaria chamomilla (chamomile): anti-inflammatory and antispasmodic.
• Mentha piperita (peppermint): relaxes the smooth muscle of the stomach.
• Carum carvi (caraway): reduces gas formation.
• Glycyrrhiza glabra (liquorice): helps protect the gastric mucosa.
• Melissa officinalis (lemon balm): calming effect on the enteric nervous system.
• Angelica archangelica (angelica): stimulates digestive secretions.
• Silybum marianum (milk thistle): hepatoprotective, supports digestion.
• Chelidonium majus (greater celandine): antispasmodic on the biliary tract.

No classic antacid covers that range on its own. That is what makes Iberogast different: it does not block a single pathway, it modulates several.

What Iberogast is for: heartburn, bloating and functional dyspepsia

The main indication is functional dyspepsia: what you feel when your stomach "does not work properly" without an ulcer or structural cause — bloating, heaviness, burning, mild nausea, early fullness. What most people call "heavy digestion". Iberogast as a herbal digestive medicine aims at this type of symptom cluster.

But its use goes beyond that.

Clinical studies with STW 5 have shown efficacy in:

• Mild to moderate heartburn, without needing to resort to a proton pump inhibitor.
• Abdominal distension and postprandial fullness.
• Irritable bowel syndrome (IBS) with predominant pain and bloating. Here the evidence is promising but more limited than in dyspepsia.
• Functional nausea not related to pregnancy.
• Epigastric pain without an identified organic cause.

What I see at the counter: many people rotate between antacids for years without addressing the underlying problem. The antacid puts out the fire but does not fix the kitchen. Iberogast works at another level — motility, muscle tone and visceral sensitivity.

How to take Iberogast: dosage for adults and children

Iberogast comes as oral drops, which you take with a little water before or during meals. If you are comparing Iberogast vs Gaviscon or other liquids, remember this is dosed in drops rather than spoonfuls.

Usual dosage

The usual duration of treatment is 4 weeks. If symptoms persist after that period, you should speak to your doctor. Not because continuing would necessarily be dangerous, but because it is sensible to rule out anything more than functional dyspepsia behind those symptoms.

How long Iberogast takes to work

This is what everyone asks. Honest answer: it depends.

Some people notice improvement on the first day, especially with bloating and nausea. Others need one or two weeks. The studies usually measure outcomes at 4 weeks, the standard treatment period.

You should not expect an immediate Almax-type effect: Iberogast does not neutralise acid; it modulates digestive function and needs consistency. An antacid is a fire extinguisher; Iberogast is like rewiring the electrics so sparks do not fly in the first place.

Iberogast vs Almax vs Gaviscon: what really sets them apart

This comparison comes up constantly. Three products associated with "stomach problems" that actually work in very different ways.

The differences that matter

A lmax neutralises gastric acid almost immediately. It works very well for occasional heartburn after a heavy meal. But it does not treat the cause. If you need to take it every day, something else is going on.

Gaviscon forms a floating barrier over stomach contents that helps prevent reflux. It is very useful if your main problem is acid coming up, especially when you lie down. But again, it does not address motility or bloating.

Iberogast, as a herbal digestive medicine, works at a functional level. It does not neutralise acid or form barriers. It regulates how your stomach moves, contracts and relaxes. It is aimed at chronic or recurrent problems where a purely antacid approach falls short.

P put simply: if your stomach burns one night, Almax makes sense. If you have reflux when lying down, Gaviscon helps. If you have spent weeks with bloating, heaviness and discomfort that do not respond to anything else, Iberogast becomes a reasonable option to discuss with your clinician or pharmacist.

Iberogast in pregnancy and breastfeeding

I need to be clear here: Iberogast is not recommended during pregnancy. The summary of product characteristics advises against its use in pregnant women due to insufficient safety data and because some of the plants (such as celandine and liquorice at higher doses) have profiles that warrant caution.

The same applies to breastfeeding: it is also not recommended. There are no studies confirming the safety of these extracts in breast milk.

I know this can be frustrating to read when you are pregnant and your stomach feels unsettled. But in this context I prefer caution over risk.

Side effects and contraindications of Iberogast

The safety profile of Iberogast is generally good. Clinical trials report an incidence of adverse effects comparable to placebo. But "good" does not mean "zero". When patients ask me about Iberogast side effects UK regulators would flag, these are the points I highlight.

P ossible side effects

• C utaneous hypersensitivity reactions (rash, itching) in people allergic to any of the plants.
• M ild gastrointestinal discomfort: nausea, diarrhoea. Paradoxical given its indication, but possible.
• I n very rare cases, hepatic reactions have been reported. The EMA reviewed this signal in 2018 and concluded that the risk is very low but added a warning in the product information.

C ontraindications

• K nown allergy to any of the nine plants or any excipient.
• A ctive liver disease (because of greater celandine).
• P regnancy and breastfeeding.
• C hildren under 3 years of age.
• B ile stones (celandine and caraway stimulate bile secretion).

Digestive supplements and natural alternatives to Iberogast

P while Iberogast joins our catalogue, there are alternatives on Farma2Go that cover parts of the functional dyspepsia spectrum. They do not do exactly the same thing but each contributes something useful depending on your pattern of symptoms.

T he Vittalogy Probiotics + Enzymes combine probiotic strains with digestive enzymes — my go-to when there is persistent bloating with suspected dysbiosis rather than pure acid issues. The VITAE IntestVita Enzymes, as a type of digestive enzyme supplement, increase enzymatic support and are ideal for people who struggle with fats, pulses or dairy products.

If you want something quick and occasional for heavy meals out, the sachets of Aquilea Digest Total stiks, one of our popular over-the-counter digestive aids UK customers choose for travel or social events, are practical: easy to carry to restaurants, trips or work functions. And if your issue seems more about gut flora than mechanical digestion itself, the chewable tablets of Probactis Biflora, a targeted probiotic supplement for gut health support, provide specific strains in an easy-to-take format.

Where to find Iberogast and alternatives in your online pharmacy

Iberogast will be available on Farma2Go shortly. We are finalising details with Bayer to add it to our catalogue — it has been one of the most frequent counter queries for months now from people searching for an effective herbal remedy for indigestion symptoms rather than another standard antacid.

I n the meantime, the digestive supplements mentioned above are already available and we ship them within 24–48 hours across Europe from our base in Cantabria. If you are unsure which suits you best based on your symptoms — whether you mainly have bloating after meals or more typical heartburn — write to us: that is exactly what we are here for.

A small piece of advice: if you have had symptoms for more than four weeks without improvement, do not keep hunting for new drops online — see your doctor instead. Functional dyspepsia overlaps with conditions that should be ruled out properly via NHS pathways where appropriate. In my experience it is better to err on the side of caution.