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Iberogast ® (STW 5)

Iberis amara - one of the nine herbal ingredients in Iberogast

Iberogast® (STW 5) is clinically proven for the treatment of abdominal discomfort associated with conditions such as Irritable Bowel Syndrome (IBS) and functional dyspepsia.1,2 Researched in 20 studies, involving more than 50,000 patients, Iberogast has been used by millions of patients since it was first launched in Europe over 50 years ago.

What is Iberogast used for?

Iberogast has been clinically proven to treat the discomfort experienced with Irritable Bowel Syndrome (IBS) and functional dyspepsia. The multi-targeted action of Iberogast is able to improve the many symptoms associated with IBS and functional dyspepsia, which can include:

Iberogast relieves heartburn, fullness, stomach pain, nausea, gas, cramping, bloating and constipation
  • Heartburn/acid reflux
  • Indigestion
  • Nausea / vomiting
  • Early satiety
  • Feeling of fullness
  • Epigastric pain
  • Bloating / abdominal cramping
  • Gas
  • Constipation / diarrhoea

Safety & efficacy

Iberogast’s safety and efficacy has been extensively researched in over 45,000 patients of all age groups, from babies to adults, in 19 clinical trials.

Iberogast has no known interactions with other medications and is very well tolerated.3,4 It has been used extensively for more than 50 years and there have been no significant adverse reactions reported in the literature or to the health authorities of different countries.

Iberogast's unique formulation

Iberogast’s unique multi-targeted formulation is clinically proven, it is the exact product used in clinical trials. This is very important for natural medicines, as there can be a great deal of variability between products, even if they appear to use the same active ingredients. This is due to the part of the plant that is used, growing methods, harvesting processes and manufacturing methods. The outcomes of clinical studies for natural medicines should therefore only apply to the exact product that has been tested.

Each bottle of Iberogast contains specific extracts of the following herbs:

    • Iberis amara (Bitter candytuft)
    • Angelica archangelica (Angelica) root
    • Matricaria recuitita (Chamomile) flowers
    • Carum carvi (Caraway) fruit
    • Silybum marianum (St Mary’s thistle)
    • Melissa officianalis (Lemon balm) leaves
    • Mentha x piperitae (Peppermint) leaves
    • Chelidonium majus (Greater celandine)
    • Glycyrrhiza glabra (Liquorice) root

Studies investigating the ways in which Iberogast work have shown that it has multiple actions in the gastrointestinal system, which is how it treats such diverse symptoms so effectively. Iberogast has been shown to exert the following multi-targeted effects:5

Iberogast treats the symptoms of abdominal discomfort associated with conditions such as Irritable Bowel Syndrome (IBS) and functional dyspepsia
  1. Normalises intestinal tone (reducing spasm and improving gut function)
  2. Promotes intestinal movement
  3. Relaxes the stomach muscles
  4. Protects the stomach lining (anti-inflammatory and anti-bacterial actions)
  5. Regulates stomach acid
  6. Reduces the formation of intestinal gases, preventing excessive flatulence and bloating

Directions & dosage

Iberogast is a liquid formulation that is taken 3 times a day, before or with meals, in a small amount of warm water, or mixed with another drink of your choice.

A dropper is already in place within the neck of the bottle to allow for easy dosing. The bottle should be shaken before use.

Iberogast Dosage chart

Always read the label. Use only as directed. If symptoms persist, or the condition recurs, it is important to speak with a healthcare professional.

How to take Iberogast

Frequently asked questions

Iberogast is a unique combination of specific plant extracts (STW 5) that is clinically proven, it is the exact product used in clinical trials. Due to the variability of natural medicine products, the tolerability and efficacy that Iberogast has demonstrated in clinical trials should not be extrapolated to other products.

Many patients report improvements within the first 2 weeks of using Iberogast, but best results are seen after 4-8 weeks' treatment.

Many years of therapeutic experience have shown no harmful effects for mothers or their children when Iberogast is used during pregnancy or lactation. However, you are recommended to speak with a healthcare professional before taking Iberogast during pregnancy or when breastfeeding.

An adjusted dose of Iberogast can be given to infants and children. It can be taken mixed in expressed breast milk (infants), water or juice and applied with a pipette for small children.

Yes, Iberogast contains 31% alcohol (ethanol), which plays an important role in the herbal extraction process.

Due to the dose of Iberogast that is recommended therapeutically, the level of alcohol ingested with each dose is very low and swiftly metabolised. Even in infants and children, Iberogast may be used with confidence and no expected adverse effects. In fact, the amount of alcohol within a single dose of Iberogast is less than what may occur naturally in some foods, such as fruits and fermented products.6

However, owing to Iberogast’s alcohol content, patients with illness or addiction related to alcohol consumption should not use Iberogast, unless under the supervision of a healthcare professional. Also, women who are pregnant or breastfeeding and patients with severe liver or kidney impairment should speak with a healthcare professional before taking Iberogast.

Iberogast has no known interactions or contraindications, however, it is important to discuss this with your healthcare professional if you have specific concerns regarding medication you are taking.

From the available clinical and experience data there is no recommendation to stop Iberogast before surgery. However, it is important to discuss this with your healthcare professional, including your anaesthetist and surgeon.

Yes, Iberogast can be taken long term.

Yes, Iberogast is gluten free.

No, Iberogast does not contain lactose.

Iberogast has no known adverse effects in these situations.

Iberogast is available from naturopaths, selected health food stores and pharmacies. If you go to the Where to buy button above and follow the instructions, you will be able to find a list of practitioners and pharmacies in your area who either stock Iberogast or will know how to order Iberogast. Even if your local pharmacy is not on the list, they will be able to order it in for you.


References: 1. Buchert D Z Phytother 1994; 15: 24-25 2. Madisch A et al Z Gastroenterol 2001; 39: 1-8 3. Rosch W et al Z Gastroenterol 2002; 40: 401-8 4. Nicolay K Gastro Entero Hepatologie 1984; 2: 24-8 5. Malfertheiner GI-Telex 2011. 6. Kelber O et al Pharm Ind 2008; 70 (9): 1124-27.
Some of this research received funding from Steigerwald Arzneimittelwerk GmbH.

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Always read the label. Use only as directed. If symptoms persist, consult your healthcare professional.