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# Dicyclomine Hydrochloride
## Overview
Dicyclomine is an anticholinergic (antimuscarinic) agent that acts as a direct smooth muscle relaxant. It is primarily used to manage functional bowel/irritable bowel syndrome (IBS).
## Primary Indications
* Management of functional bowel/irritable bowel syndrome (IBS).
## Adult Dosing
* **Initial:** 20 mg orally four times daily.
* **Titration:** After 1 week, if side effects allow and efficacy is insufficient, dose may be increased to 40 mg four times daily.
* **Maximum:** 160 mg per day.
* *Note: If no clinical improvement after 2 weeks, discontinue therapy.*
## Pediatric Dosing
* **Safety/Efficacy:** Not recommended for use in pediatric patients due to the risk of serious anticholinergic adverse events, particularly in infants under 6 months of age (contraindicated).
## Dose Adjustments
* **Renal/Hepatic Impairment:** No specific manufacturer guidelines, but use with extreme caution due to decreased clearance and potential for systemic toxicity in hepatic or renal insufficiency.
* **Geriatric:** Avoid, if possible (Beers Criteria). Increased risk of cognitive impairment, delirium, falls, and urinary retention. If necessary, use the lowest effective dose.
## Contraindications
* Infants < 6 months of age.
* Unstable cardiovascular status in acute hemorrhage.
* Myasthenia gravis.
* Obstructive disease of the GI tract (e.g., pyloric stenosis, paralytic ileus).
* Severe ulcerative colitis or toxic megacolon.
* Glaucoma.
* Reflux esophagitis.
* Urinary tract obstruction (e.g., prostatic hypertrophy).
## Adverse Effects
* **Anticholinergic:** Xerostomia (dry mouth), blurred vision, constipation, urinary retention, tachycardia, dizziness, and decreased sweating.
* **CNS:** Confusion (especially in elderly), lightheadedness, somnolence, nervousness.
## Key Drug Interactions
* **Other Anticholinergics:** Synergistic effects (additive risk of urinary retention, constipation, tachycardia).
* **CNS Depressants:** Increased sedative effects (e.g., benzodiazepines, opioids, alcohol).
* **Digoxin:** Increased digoxin serum levels due to decreased GI motility (increased absorption time).
* **Antacids:** May interfere with dicyclomine absorption; separate administration times.
## Monitoring
* Monitor for signs of anticholinergic toxicity (hallucinations, confusion, urinary retention).
* Monitor bowel habits to ensure absence of paralytic ileus or obstruction.
* In geriatric populations, monitor cognitive function and fall risk.
## Clinical Pearls
* **Heat Sensitivity:** Dicyclomine can inhibit sweating. Caution patients to avoid overheating, exercise in hot weather, or saunas, as this can lead to heat prostration.
* **Drowsiness:** Advise patients that the drug may impair physical or mental abilities; caution when operating machinery or driving.
* **Route:** Oral formulation is the standard recommendation. Intramuscular injection exists but is reserved for highly specific clinical scenarios due to limited data on long-term safety compared to oral dosing.
* **Efficacy:** If there is no response after 2 weeks, it is unlikely the drug will provide benefit.
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**Disclaimer:** This information is for educational purposes only. Clinical guidelines and prescribing protocols vary by institution and region. Always verify specific dosages and patient contraindications against current, official prescribing information (package insert) or institutional formularies before prescribing or administering medication.
