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# Dextromethorphan (DM) Cold
## Overview
Dextromethorphan (DM) is an antitussive (cough suppressant) that acts centrally on the cough center in the medulla oblongata. It is commonly found in over-the-counter (OTC) combination products for cough and cold symptoms.
## Primary Indications
Symptomatic relief of cough due to minor throat and bronchial irritation.
## Adult Dosing
* **Oral:** 10 mg to 20 mg every 4 hours, or 30 mg every 6 to 8 hours.
* **Maximum Dose:** Typically 120 mg per 24 hours. Specific maximums depend on the formulation and combination product.
## Pediatric Dosing
* **Ages 12 years and older:** Same as adult dosing.
* **Ages 6 to under 12 years:** 5 mg to 10 mg every 4 hours, or 15 mg every 6 to 8 hours.
* **Maximum Dose (6-11 years):** Typically 60 mg per 24 hours.
* **Ages under 6 years:** Safety and efficacy are not established for routine use. Many combination products are not recommended for this age group. Consult with a pediatrician.
## Dose Adjustments
No specific dose adjustments are typically required for hepatic or renal impairment, but caution and patient monitoring are advised due to potential accumulation.
## Contraindications
* Hypersensitivity to dextromethorphan.
* Use within 14 days of MAO inhibitors.
* Patients with significant respiratory disease (e.g., asthma, emphysema) as it may impair the ability to cough up mucus.
## Adverse Effects
* Drowsiness, dizziness, lightheadedness
* Nausea, vomiting, stomach upset
* Constipation
* Confusion, nervousness
* **Rare but serious:** Serotonin syndrome (especially when combined with other serotonergic agents), respiratory depression, abuse potential with high doses leading to euphoria and hallucinations.
## Key Drug Interactions
* **MAO Inhibitors:** Increased risk of serotonin syndrome, hypertensive crisis.
* **Serotonergic Agents (e.g., SSRIs, SNRIs, triptans, tramadol):** Increased risk of serotonin syndrome.
* **CYP2D6 Inhibitors (e.g., fluoxetine, paroxetine, quinidine):** May increase dextromethorphan plasma concentrations, increasing risk of adverse effects.
* **Alcohol:** Additive CNS depression.
## Monitoring
* Monitor for effectiveness of cough suppression.
* Assess for adverse effects, particularly CNS effects, GI upset, and signs of serotonin syndrome.
* For patients with respiratory conditions, monitor for any signs of increased respiratory compromise.
## Clinical Pearls
* Dextromethorphan is often present in combination cold and cough products with other ingredients like decongestants, antihistamines, and expectorants. Ensure accurate dosing and avoid duplication of ingredients.
* Be aware of the abuse potential with higher than recommended doses.
* Not generally recommended for chronic cough or cough with excessive secretions.
* Formulations vary (e.g., liquid, capsule, lozenge, extended-release). Follow specific product instructions.
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**Disclaimer:** This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information and local protocols before making any treatment decisions.
