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Diosmectite

Intestinal adsorbents (natural smectite)

ATC code: A07BC05

Brand names: Smecta

Updated · Methodology

Indications

B

Acute diarrhea in adults

Individual decision

In acute diarrhea in adults, the basis of treatment is oral rehydration; diosmectite (smectite) is an optional symptomatic adsorbent that modestly shortens the duration of diarrhea. Adult evidence is limited: a single RCT (Khediri, 2011, n=346) showed the median recovery time fall from 69 to 54 hours (about a 15-hour difference) with good tolerability, and the certainty is low (single RCT). The larger smectite data come from children (Cochrane, Perez-Gaxiola, 2018) and do not transfer directly to adults. 2016 (acute diarrheal infections in adults) does not make diosmectite first-line and does not recommend against it.

Sources

  1. Gastroenterology Research and Practice: Efficacy of Diosmectite (Smecta)® in the Treatment of Acute Watery Diarrhoea in Adults: A Multicentre, Randomized, Double-Blind, Placebo-Controlled, Parallel Group Study (2011)
  2. Archives of Disease in Childhood: Efficacy and safety of diosmectite in acute childhood diarrhoea: a meta-analysis (2015)
  3. Cochrane Database of Systematic Reviews: Smectite for acute infectious diarrhoea in children (2018)
  4. American Journal of Gastroenterology: ACG Clinical Guideline: Diagnosis, Treatment, and Prevention of Acute Diarrheal Infections in Adults (2016)

ICD-10: A09 · ICD-11: ME05.1

Marketing claims without evidence base

The drug is promoted for these uses outside international guidelines. Each entry below is analyzed against AEMPS, FDA, EMA, Cochrane and major RCTs.

D

Hangover recovery

Not recommended

Diosmectite (Smecta, Neosmectin) is promoted as an enterosorbent for hangover, poisoning, and detoxification. Convincing benefit for hangover has not been shown: there are no quality RCTs, and alcohol-intoxication guidelines ( 2017, ASAM 2020) do not mention it. The sorbent itself is well tolerated, and its established role is limited to acute diarrhea. A hangover resolves on its own; time, fluids, and sleep help. Note that diosmectite reduces the absorption of other drugs taken at the same time.

Sources

  1. Int J Pharm: Drug interactions with diosmectite: a study using the artificial stomach-duodenum model. (1999)

ICD-11: MG49

D

Irritable bowel syndrome

Not recommended

Small RCTs showed a modest effect of diosmectite in IBS-D. 2021 does not mention it. and also exclude it from IBS standards. Use is justified only sporadically for symptomatic diarrhea relief – not for long-term therapy.

Sources

  1. J Gastroenterol Hepatol: Efficacy of dioctahedral smectite in treating patients of diarrhea-predominant irritable bowel syndrome. (2007)
  2. Adv Ther: The Role of Purported Mucoprotectants in Dealing with Irritable Bowel Syndrome, Functional Diarrhea, and Other Chronic Diarrheal Disorders in Adults. (2021)
  3. ACG: ACG clinical guideline: management of irritable bowel syndrome (2021)

ICD-10: K58.8 · ICD-11: DD91.0Z

How to read tiers A–F
  • AStrong evidence – first or second line in international guidelines
  • BRecommended in selected cases
  • CStudy data contradict each other
  • DBenefit not proven, no documented harm
  • FDocumented harm, or risk without benefit

Mechanism of action

Natural dioctahedral smectite (aluminum-magnesium silicate) with a layered crystalline structure. Binds bacteria, viruses, toxins, and bile acids in the intestinal lumen. Stabilizes the mucin layer of intestinal epithelium and increases resistance to aggressive factors. Not absorbed, not metabolized, excreted unchanged. RCT-proven efficacy in pediatric acute diarrhea, traveler's diarrhea, and drug-induced diarrhea.

Safety

Contraindications

  • Hypersensitivity
  • Intestinal obstruction
  • Age under 2 years (per ANSM 2019 restriction)
  • Severe constipation (relative)

Serious adverse effects

  • Intestinal obstruction (very rare, in dehydration)
  • Allergic reactions (rare)

Common adverse effects

  • Constipation
  • Nausea, vomiting (rare)

Pregnancy: can you take Diosmectite?

Not absorbed; no documented systemic fetal effects. Acceptable in pregnancy on indication.

Breastfeeding: can you take Diosmectite?

Compatible with breastfeeding — not absorbed.

Calculate RID

Reference information, not a clinical decision. Discuss feeding pauses or changes with your physician or an IBCLC.

Practical notes

Timing and administration

Dissolve the sachet contents in 50 mL of water and drink immediately. In children, dissolve in formula, broth, or water across the day. Take between meals (1–2 hours after food) — concurrent food intake risks nutrient sorption. Take other medications 1–2 hours before or after diosmectite — the drug adsorbs and reduces absorption of co-administered drugs.

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Frequently asked

What is Diosmectite used for?

Diosmectite is evaluated for the following indications with varying evidence strength: Acute diarrhea in adults (evidence tier B), Irritable bowel syndrome (evidence tier D), Hangover recovery (evidence tier D). See the full indication matrix with dosing and citations above on this page.

What are the side effects of Diosmectite?

Common side effects of Diosmectite (≥ 1 in 100): Constipation, Nausea, vomiting (rare). See the Safety section for uncommon and serious reactions.

Is Diosmectite safe during pregnancy?

Not absorbed; no documented systemic fetal effects. Acceptable in pregnancy on indication.

Is Diosmectite compatible with breastfeeding?

Compatible with breastfeeding — not absorbed.

Who should not take Diosmectite?

Diosmectite is contraindicated in: Hypersensitivity; Intestinal obstruction; Age under 2 years (per ANSM 2019 restriction); Severe constipation (relative). Full list in the Safety section.

Other drugs in this group

Lactobacillus rhamnosus GG (LGG), Loperamide, Mesalazine, Nifuroxazide, Saccharomyces boulardii CNCM I-745, Berberine, Nystatin, Probiotics (Lactobacillus spp., Bifidobacterium spp., Saccharomyces boulardii)