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# Dicyclomine Hydrochloride
## Overview
Dicyclomine hydrochloride is an anticholinergic and antispasmodic medication primarily used to relieve smooth muscle spasms and associated pain, particularly in the gastrointestinal tract.
## Primary Indications
* Cramping and pain associated with irritable bowel syndrome (IBS) and other gastrointestinal disorders.
## Adult Dosing
* **Oral suspension/tablets:**
* Initial dose: 10 mg to 20 mg four times daily.
* Titration: Dose may be increased gradually based on clinical response and tolerance, up to a maximum of 40 mg four times daily (160 mg/day).
* **Intramuscular injection:**
* 10 mg to 20 mg intramuscularly every 4 to 6 hours as needed.
* Maximum daily dose by injection is typically 80 mg.
## Pediatric Dosing
Dicyclomine is generally **not recommended** for infants and children under 6 months of age due to the risk of serious adverse effects, including respiratory depression, coma, and circulatory collapse. For children aged 6 months and older:
* **Oral suspension:**
* 5 mg to 10 mg three or four times daily.
* Dosing should be individualized and carefully monitored.
## Dose Adjustments
No specific dose adjustments are routinely necessary for hepatic or renal impairment, but caution is advised due to potential accumulation and increased risk of anticholinergic side effects.
## Contraindications
* Hypersensitivity to dicyclomine.
* Infants younger than 6 months.
* Glaucoma (especially narrow-angle).
* Myasthenia gravis.
* Gastrointestinal obstruction or atony.
* Unstable cardiovascular status in acute hemorrhage.
* Toxic megacolon.
## Adverse Effects
Common anticholinergic side effects include: dry mouth, blurred vision, drowsiness, dizziness, urinary retention, constipation, and confusion. More serious effects can include tachycardia, hypotension, and exacerbation of narrow-angle glaucoma.
## Key Drug Interactions
* **Anticholinergic agents:** Additive anticholinergic effects.
* **MAO inhibitors:** May potentiate anticholinergic effects.
* **Antacids:** May decrease absorption of oral dicyclomine. Administer dicyclomine at least 1 hour before or after antacids.
* **Opioid analgesics:** Increased risk of severe constipation and ileus.
* **Cimetidine:** May prolong the effect of dicyclomine.
## Monitoring
* Monitor for efficacy in relieving abdominal pain and cramping.
* Monitor for anticholinergic side effects (e.g., dry mouth, blurred vision, urinary retention, confusion, constipation).
* Monitor bowel function, especially in patients with a history of gastrointestinal issues.
* In infants and children, monitor closely for any signs of respiratory distress or central nervous system depression.
## Clinical Pearls
* Dicyclomine is most effective when taken before meals.
* Due to its anticholinergic properties, use with caution in the elderly, as they are more susceptible to side effects like confusion and urinary retention.
* The risk of serious adverse effects in infants under 6 months necessitates extreme caution or avoidance.
* Intramuscular injection is typically reserved for situations where oral administration is not feasible.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and local protocols for definitive guidance. Dosing and recommendations may vary.*
