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# Dicyclomine Hydrochloride
## Overview
Dicyclomine hydrochloride is an anticholinergic and antispasmodic medication. It works by relaxing smooth muscle in the gastrointestinal tract, reducing spasms and pain.
## Primary Indications
* Symptomatic relief of irritable bowel syndrome (IBS) and other functional bowel disorders.
## Adult Dosing
* **Oral:** Initially 20 mg four times daily. Doses can be increased gradually based on patient response and tolerance, up to a maximum of 160 mg daily (40 mg four times daily).
* **Intramuscular (IM):** 20 mg every 4-6 hours as needed. IM route is typically reserved for patients unable to take oral medication.
## Pediatric Dosing
* **Oral:** Dicyclomine is **not recommended** for use in infants and children under 6 months of age due to the risk of serious adverse effects, including respiratory depression, circulatory collapse, ileus, and coma. For children 6 months and older, the dose is individualized based on weight and severity of symptoms, but generally starts at 5 mg three to four times daily and may be increased cautiously. Dosing for this age group is often guided by institutional protocols.
## Dose Adjustments
* No specific dose adjustments are routinely recommended for renal or hepatic impairment, but caution is advised due to potential for increased anticholinergic effects.
## Contraindications
* Hypersensitivity to dicyclomine.
* Glaucoma (except perhaps narrow-angle glaucoma if absolutely necessary and benefits outweigh risks, but generally avoided).
* Obstructive uropathy (e.g., bladder neck obstruction).
* Gastrointestinal obstruction.
* Severe ulcerative colitis.
* Myasthenia gravis.
* Infants less than 6 months of age.
## Adverse Effects
* **Anticholinergic effects:** Dry mouth, blurred vision, urinary retention, constipation, drowsiness, dizziness, confusion.
* **Cardiovascular:** Tachycardia.
* **Other:** Rash.
## Key Drug Interactions
* **Other anticholinergic agents:** Additive effect, increasing the risk of anticholinergic side effects.
* **MAO inhibitors:** May prolong and intensify anticholinergic effects.
* **Antacids:** May decrease the absorption of oral dicyclomine. Administer dicyclomine 1 hour before or 2 hours after antacids.
## Monitoring
* Monitor for therapeutic efficacy (relief of abdominal pain and spasms).
* Monitor for adverse effects, especially anticholinergic side effects.
* In infants, monitor closely for signs of overdose or serious adverse events.
## Clinical Pearls
* Dicyclomine is generally less effective at higher doses and more likely to cause dose-related anticholinergic side effects.
* The IM route should be used judiciously due to potential for systemic absorption and side effects.
* Due to the potential for serious side effects in infants, and contraindications in specific conditions, careful patient selection and monitoring are crucial.
* Alternative agents may be considered if dicyclomine is ineffective or poorly tolerated.
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*This information is for educational purposes only and does not substitute for professional medical advice. Always verify current prescribing information with the latest official drug monographs or institutional protocols.*
