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Glycerol

AEMPS

Rectal laxative, osmotic and stimulant

ATC code: A06AG04

Brand names: Fleet Glycerin Suppositories

Updated · Methodology

Indications

B

Occasional constipation

Second line

A glycerol suppository or micro-enema is the fastest way to resolve occasional constipation: a stool arrives within 15 to 30 minutes. The AEMPS ficha técnica frames the indication as local symptomatic relief of transient and occasional constipation, and for the 7.5 g solution in adults and adolescents from 12 years, one pack a day. Children need their own lower-dose forms. There is one rule: no longer than 7 days in a row. The ficha asks people to stop and reassess if blood appears in the stool, if there is irritation and pain, or if bowel habit has not returned. Water, fibre and movement still come first in constipation, and the rectal product is there for the case when the problem has to be solved today.

Sources

  1. AEMPS: Ficha técnica de glicerol (2023)

ICD-10: K59.0

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

Hemorrhoidal disease

Not recommended

With hemorrhoids constipation is doubly hard, and a glycerol suppository looks like the obvious answer. The AEMPS ficha técnica thinks otherwise: anorectal disorders, hemorrhagic proctocolitis and inflammatory hemorrhoidal processes are among the contraindications. The reason is simple: the suppository mechanically irritates the inflamed pile and the lining, and the flare worsens. The logic of hemorrhoid treatment is the reverse – soften the stool systemically rather than irritate the rectum. That means fibre, water, an oral osmotic laxative, sitz baths and topical products prescribed by a doctor. Rectal bleeding is also not always hemorrhoidal, and writing it off to piles without an examination is unsafe. If glycerol suppositories were advised during a hemorrhoid flare, consider seeking a second opinion.

Sources

  1. AEMPS: Ficha técnica de glicerol (2023)

ICD-10: K64 · ICD-11: DB60

F

Body detoxification and cleansing

Not recommended

Enemas and rectal laxatives are sold as «bowel cleansing»: a course before a diet, «removal of toxins», preparation for a «body reset». Glycerol has no such effect. It empties the rectum and stops there, and there are no accumulated toxins in the bowel to wash out: the contents of the colon are undigested food residue with bacteria, and they leave by themselves. Regular enemas meanwhile alter the usual rhythm of defecation, irritate the lining and create dependence on an external stimulus. The AEMPS ficha técnica asks to avoid chronic use and limits the course to 7 days. If a course of enemas was advised to cleanse the body or prepare for a diet, consider seeking a second opinion.

Sources

  1. AEMPS: Ficha técnica de glicerol (2023)
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

In the rectum glycerol works from two sides at once. It irritates nerve endings in the lining and triggers the defecation reflex, while simultaneously raising osmotic pressure in the lumen so that water moves into the bowel, the stool softens and peristalsis increases. The AEMPS ficha técnica calls the action mixed – stimulant and osmotic together. The substance is not absorbed through the rectum and acts locally only, so it has no systemic effects, and a stool usually arrives within 15 to 30 minutes. The forms differ: suppositories and micro-enemas, pediatric and adult, and the dose sets the age limit – in the 7.5 g solution the product is allowed from 12 years.

Safety

Contraindications

  • Hypersensitivity to glycerol
  • Anorectal disorders, hemorrhagic proctocolitis, inflammatory hemorrhoids
  • Cramping pain, colic, nausea, vomiting and other signs of appendicitis
  • Bowel obstruction
  • Acute inflammatory bowel disease
  • Abdominal pain of unclear origin
  • Children under 12 years for the adult dose

Serious adverse effects

  • Blood in the stool when the lining is injured
  • Dependence on an external defecation stimulus with prolonged use

Common adverse effects

  • Anal pain
  • Anal itching and burning
  • Irritation of the rectal lining

Pregnancy: can you take Glycerol?

The ficha técnica leaves the decision to the doctor. Rectal glycerol has no systemic absorption, so in constipation of pregnancy it is regarded as one of the acceptable options after fibre and water.

Breastfeeding: can you take Glycerol?

Rectal glycerol does not reach the bloodstream and meaningful passage into breast milk is not expected. The decision follows the clinical situation.

Calculate RID

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

Label mentions1 mention

Verbatim lines from the interaction sections, in the language of the label

From other drugs’ labels

  • Thiamazole
    «La administración glicerol yodado, yodo o yoduro potásico puede disminuir la respuesta a los antitiroideos.»

    AEMPS, section 4.5 · Open on CIMA

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Frequently asked

What is Glycerol used for?

Glycerol is evaluated for the following indications with varying evidence strength: Occasional constipation (evidence tier B), Hemorrhoidal disease (evidence tier D), Body detoxification and cleansing (evidence tier F). See the full indication matrix with dosing and citations above on this page.

What are the side effects of Glycerol?

Common side effects of Glycerol (≥ 1 in 100): Anal pain, Anal itching and burning, Irritation of the rectal lining. See the Safety section for uncommon and serious reactions.

Is Glycerol safe during pregnancy?

The ficha técnica leaves the decision to the doctor. Rectal glycerol has no systemic absorption, so in constipation of pregnancy it is regarded as one of the acceptable options after fibre and water.

Is Glycerol compatible with breastfeeding?

Rectal glycerol does not reach the bloodstream and meaningful passage into breast milk is not expected. The decision follows the clinical situation.

Who should not take Glycerol?

Glycerol is contraindicated in: Hypersensitivity to glycerol; Anorectal disorders, hemorrhagic proctocolitis, inflammatory hemorrhoids; Cramping pain, colic, nausea, vomiting and other signs of appendicitis; Bowel obstruction; Acute inflammatory bowel disease. Full list in the Safety section.

Official sources

Direct links to regulator labels. Open in a new tab.

Other drugs in this group

Bisacodyl, Inulin (chicory/agave/Jerusalem artichoke prebiotic), Psyllium (Plantago ovata, ispaghula husk), Sodium lauryl sulfoacetate, Sodium picosulfate