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# Dicyclomine Hydrochloride
## Overview
Dicyclomine hydrochloride is an anticholinergic and antispasmodic medication used to relieve smooth muscle spasms, particularly in the gastrointestinal tract. It works by blocking the action of acetylcholine on smooth muscle.
## Primary Indications
* Irritable bowel syndrome (IBS)
* Intestinal colic
* Biliary colic
## Adult Dosing
* **Oral:** Start with 10-20 mg three to four times daily. Gradually increase dose as tolerated to a maximum of 80 mg per day (20 mg four times daily).
* **Injectable (IM):** 10-20 mg three to four times daily. Typically reserved for more severe symptoms or when oral administration is not feasible.
Dosing regimens may vary; consult local protocols for specific guidance.
## Pediatric Dosing
* **Oral:** Dicyclomine is generally NOT recommended for infants under 6 months due to risk of serious adverse effects, including respiratory depression, coma, and circulatory collapse.
* For children **6 months and older**: Start with 5 mg three to four times daily. Gradually increase dose as tolerated and age-appropriate to a maximum of 20 mg per day.
There is limited robust evidence to support pediatric dosing; use with caution and close monitoring.
## Dose Adjustments
No specific dose adjustments are typically required for renal or hepatic impairment, but caution is advised due to potential for accumulation and increased anticholinergic effects.
## Contraindications
* Hypersensitivity to dicyclomine
* Glaucoma (angle-closure)
* Infants under 6 months
* Myasthenia gravis
* Obstructive uropathy (e.g., bladder neck obstruction)
* Obstructive gastrointestinal lesions or paralytic ileus
* Severe ulcerative colitis or reflux esophagitis
## Adverse Effects
Common:
* Dry mouth
* Blurred vision
* Drowsiness
* Dizziness
* Constipation
* Urinary retention
* Reduced sweating
Serious:
* Confusion, delirium, hallucinations (especially in elderly)
* Tachycardia
* Heat prostration (due to reduced sweating)
* Serious adverse effects in infants (respiratory depression, coma, circulatory collapse)
## Key Drug Interactions
* **Anticholinergics (e.g., other antimuscarinics, some antidepressants, antihistamines):** Additive anticholinergic effects, increasing risk of dry mouth, constipation, urinary retention, blurred vision, and CNS effects.
* **CNS Depressants (e.g., benzodiazepines, opioids, alcohol):** Increased sedation and CNS depression.
* **Guanethidine:** Dicyclomine may antagonize the antihypertensive effect of guanethidine.
* **MAO Inhibitors:** Potential for increased anticholinergic effects.
## Monitoring
* Monitor for therapeutic effectiveness (relief of spasmodic pain).
* Monitor for adverse effects, particularly anticholinergic side effects, confusion, and sedation, especially in the elderly.
* In infants, monitor very closely for signs of respiratory distress, altered consciousness, or circulatory issues.
## Clinical Pearls
* Dicyclomine is most effective when taken before meals.
* Due to anticholinergic side effects, caution is advised in elderly patients and those with pre-existing conditions like cardiac, hepatic, or renal disease.
* Avoid use in infants under 6 months due to serious safety concerns.
* Hydration and stool softeners may help manage constipation.
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*Disclaimer: This information is intended for clinical decision support and does not replace professional medical advice. Always consult the most current prescribing information and relevant guidelines for definitive patient care.*
