Dicyclomine
Prescription ·Exploratory record · not publication-reviewed ·Updated July 13, 2026
Dicyclomine is an anticholinergic antispasmodic used for functional bowel and irritable bowel syndrome with painful intestinal cramping. It reduces gastrointestinal smooth muscle spasm but can cause clinically important anticholinergic adverse effects, especially in infants, older adults, glaucoma, urinary retention, and obstructive gastrointestinal disease.
Exploratory record, not a reviewed medical publication.
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What the research says.
A quick, data-only summary. The full evidence, dosing, and sources are below.
Dicyclomine is an anticholinergic antispasmodic used for functional bowel and irritable bowel syndrome with painful intestinal cramping. NutriStack rates the supporting evidence as strong. Common adult dosing is Adults: usually 20 mg orally four times daily; may increase to 40 mg four times daily if tolerated. Discontinue if meaningful response is not achieved within 2 weeks or if adverse effects prevent use at effective doses., though a prescriber sets the actual dose. This profile indexes 3 sources.
The bottom line
Evidence rating strong. Most-documented uses: short-term relief of irritable bowel syndrome cramping, reduction of functional gastrointestinal smooth muscle spasm, adjunctive symptom control for abdominal pain related to bowel spasm. 3 sources indexed (2008–2026), with 0 interaction records on file.
How it works, mechanistically.
Core mechanism
Dicyclomine antagonizes muscarinic acetylcholine receptors and also has a direct relaxant effect on gastrointestinal smooth muscle. Reduced parasympathetic tone decreases intestinal motility and spasm, which can improve cramping pain in irritable bowel syndrome. The same antimuscarinic activity can impair sweating, accommodation, bladder emptying, bowel transit, and cognition, explaining heat illness, blurred vision, constipation, urinary retention, tachycardia, confusion, and delirium risks.2,3
Dosing & protocol.
Oral doses may be taken with or without food. Separate from bulky fiber if symptoms or absorption concerns occur, and avoid alcohol or other sedatives when drowsiness is present.
Full safety detail.
Side effects
- Dry mouth
- Blurred vision
- Constipation
- Nausea
- Dizziness
- Drowsiness
- Urinary retention
- Tachycardia or palpitations
- Confusion or delirium, especially in older adults
- Heat intolerance or heat stroke from reduced sweating
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Meta-analyses & systematic reviews
1- 1Effect of fibre, antispasmodics, and peppermint oil in the treatment of irritable bowel syndrome: systematic review and meta-analysisFord AC et al. · BMJ · 2008
Antispasmodic therapy showed benefit for global IBS symptoms, though adverse effects and study quality vary.
Reviews & position papers
1- 2ACG Clinical Guideline: Management of Irritable Bowel SyndromeLacy BE et al. · American Journal of Gastroenterology · 2021
Guideline emphasizes symptom-directed IBS therapy and careful adverse-effect consideration with antispasmodics.
Reference material
1- 3Dicyclomine Hydrochloride Tablets US Prescribing InformationURLU.S. National Library of Medicine · DailyMed · 2026
Labeling lists IBS indication, adult dosing, contraindications including infants, glaucoma, myasthenia gravis, obstruction, breastfeeding, and warnings for heat prostration and delirium.
Common questions.
Quick answers about Dicyclomine, drawn from the data on this page.
What is Dicyclomine?
Dicyclomine is an anticholinergic antispasmodic used for functional bowel and irritable bowel syndrome with painful intestinal cramping. It reduces gastrointestinal smooth muscle spasm but can cause clinically important anticholinergic adverse effects, especially in infants, older adults, glaucoma, urinary retention, and obstructive gastrointestinal disease.
What is Dicyclomine used for?
Commonly cited benefits of Dicyclomine include: Short-term relief of irritable bowel syndrome cramping; Reduction of functional gastrointestinal smooth muscle spasm; Adjunctive symptom control for abdominal pain related to bowel spasm. NutriStack rates the overall evidence as strong.
What is a typical dose of Dicyclomine?
A typical adult dose of Dicyclomine is Adults: usually 20 mg orally four times daily; may increase to 40 mg four times daily if tolerated. Discontinue if meaningful response is not achieved within 2 weeks or if adverse effects prevent use at effective doses.. The commonly recommended form is Oral tablet, capsule, or solution; injectable forms are generally reserved for short-term supervised use. These are general ranges, not personalized advice; confirm the right dose with a clinician.
What are the side effects of Dicyclomine?
Reported side effects include dry mouth, blurred vision, constipation, nausea, dizziness, drowsiness. This is educational information; check with a healthcare professional before use.
How strong is the evidence for Dicyclomine?
NutriStack rates this as Strong, meaning multiple high-quality meta-analyses or systematic reviews converge on the same finding. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.
Use this with your stack
Dicyclomine in NutriStack.
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