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# Dicyclomine hydrochloride
## Overview
Dicyclomine is an antispasmodic and anticholinergic agent that acts directly on smooth muscle of the gastrointestinal tract to relieve spasms. Its mechanism involves both anticholinergic effects and a direct effect on smooth muscle receptors.
## Primary Indications
* Treatment of functional bowel/irritable bowel syndrome (IBS).
## Adult Dosing
* **Oral:** 20 mg 4 times daily.
* If efficacy is not achieved within 2 weeks, or side effects are intolerable, consider discontinuation.
* **Maximum:** 80 mg/day.
## Pediatric Dosing
* **Safety and efficacy in pediatric patients have not been established.**
* **Warning:** Dicyclomine is **contraindicated** in infants less than 6 months of age due to reports of serious respiratory symptoms, seizures, syncope, and death.
## Dose Adjustments
* **Renal/Hepatic Impairment:** No specific manufacturer guidelines, but use with extreme caution in patients with impaired renal or hepatic function due to potential accumulation of anticholinergic effects.
* **Geriatric:** Use with caution. The Beers Criteria classifies dicyclomine as a drug to avoid in older adults due to high anticholinergic risk.
## Contraindications
* Infants < 6 months old.
* Unstable cardiovascular status in acute hemorrhage.
* Myasthenia gravis.
* Obstructive uropathy or gastrointestinal disease (e.g., paralytic ileus, severe ulcerative colitis, megacolon).
* Glaucoma.
* Reflux esophagitis.
## Adverse Effects
* **Common:** Dry mouth, dizziness, blurred vision, nausea, lightheadedness, drowsiness, weakness, and nervousness.
* **Serious:** Heat prostration (at high environmental temperatures), tachycardia, confusion, urinary retention, and anaphylaxis/hypersensitivity reactions.
## Key Drug Interactions
* **Anticholinergics:** Concomitant use (e.g., TCAs, antihistamines, antipsychotics) increases risk of additive anticholinergic toxicity.
* **Potassium Chloride:** Increased risk of gastrointestinal mucosal lesions/ulceration when administered with solid oral dosage forms of potassium.
* **Antacids:** May interfere with the absorption of dicyclomine; administer separately.
## Monitoring
* Monitor for signs of anticholinergic toxicity (e.g., urinary retention, tachycardia, confusion, constipation).
* Monitor for therapeutic effect on GI symptoms.
## Clinical Pearls
* **Heat Sensitivity:** Advise patients that dicyclomine can cause heat prostration (fever/heat stroke) due to decreased sweating; counsel patients to avoid vigorous exercise or extreme heat.
* **Cognitive Impact:** Anticholinergic burden is significant; avoid whenever possible in patients with pre-existing cognitive impairment.
* **Administration:** May be taken with or without food.
* **Drowsiness:** Caution patients regarding the operation of heavy machinery or driving, as the drug may cause dizziness or blurred vision.
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*Educational Disclaimer: This information is for educational purposes and does not substitute for professional clinical judgment. Always verify current prescribing information, institutional protocols, and patient-specific factors before prescribing or administering medication.*
