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# Dicyclomine Hydrochloride
## Overview
Dicyclomine is an anticholinergic (antispasmodic) agent. It exerts a direct relaxant effect on smooth muscle of the gastrointestinal tract, likely through a combination of muscarinic receptor blockade and direct action on smooth muscle cells.
## Primary Indications
Functional bowel/irritable bowel syndrome (IBS).
## Adult Dosing
* **Initial:** 20 mg orally four times daily.
* **Maintenance:** May increase to 40 mg four times daily if tolerated after 1 week.
* **Max dose:** 160 mg per day.
* *Note:* Discontinue if efficacy is not achieved after 2 weeks of treatment at the maximum tolerated dose.
## Pediatric Dosing
* **Efficacy and safety have not been established** for the treatment of infantile colic or other GI disorders in pediatric patients. Use is generally avoided in infants < 6 months due to reported fatal respiratory distress and seizures.
## Dose Adjustments
* **Renal/Hepatic Impairment:** No specific guidelines exist; use with caution.
* **Geriatric:** Use with extreme caution. Due to the Beers Criteria, avoid in older adults due to high risk of anticholinergic side effects (e.g., delirium, urinary retention, constipation).
## Contraindications
* Infants < 6 months.
* Unstable cardiovascular status in acute hemorrhage.
* Myasthenia gravis.
* Obstructive disease of the GI tract (e.g., pyloroduodenal stenosis).
* Paralytic ileus or intestinal atony.
* Severe ulcerative colitis or toxic megacolon.
* Glaucoma (narrow-angle).
## Adverse Effects
* **Common:** Dry mouth, dizziness, blurred vision, constipation, nausea, somnolence, asthenia.
* **Serious:** Anticholinergic psychosis (confusion, hallucinations), tachycardia, urinary retention, heatstroke (due to decreased sweating).
## Key Drug Interactions
* **Anticholinergics:** Additive effects (e.g., antihistamines, tricyclic antidepressants, antipsychotics).
* **Digoxin:** Increased absorption of digoxin tablets (via altered GI motility).
* **Potassium Chloride (Solid dosage forms):** Increased risk of GI mucosal lesions due to prolonged retention.
## Monitoring
* Monitor for signs of anticholinergic toxicity (e.g., urinary retention, severe constipation, confusion).
* Monitor heart rate and blood pressure, especially during dose escalation.
## Clinical Pearls
* Dicyclomine has minimal effect on gastric acid secretion and is not indicated for peptic ulcer disease.
* Advise patients to avoid tasks requiring mental alertness until individual response is known.
* Caution patients regarding strenuous activity or exposure to high temperatures to prevent heatstroke caused by reduced sweating.
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**Disclaimer:** This information is for educational purposes and is not a substitute for professional clinical judgment. Always verify current prescribing information, institutional protocols, and patient-specific factors before administering any medication.
