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# Dextromethorphan (as part of a "cold" formulation) ## Overview Dextromethorphan is a centrally acting cough suppressant. It is often found in combination products for the symptomatic relief of cough associated with the common cold. ## Primary Indications Symptomatic relief of cough. ## Adult Dosing Commonly available in liquid or solid dosage forms. Typical doses range from **10 mg to 30 mg every 4 to 12 hours** as needed. Maximum daily dose is generally **120 mg**. Specific dosing varies by product formulation. ## Pediatric Dosing Dosing in children under 12 years of age is generally **not recommended** due to lack of efficacy and potential for serious adverse events. For children **12 years and older**, adult dosing may be used. Consult specific product labeling for age-appropriate dosing if available. ## Dose Adjustments No specific dose adjustments are typically required for renal or hepatic impairment, though caution is advised in severe liver disease. ## Contraindications * Hypersensitivity to dextromethorphan. * Use within 14 days of MAO inhibitor therapy. * Concurrent use with certain serotonergic agents (see Key Drug Interactions). * Children under 12 years old are generally not recommended. ## Adverse Effects Common: Dizziness, drowsiness, nausea, vomiting, constipation. Less common: Confusion, agitation, hallucinations (especially at higher doses). ## Key Drug Interactions * **MAO Inhibitors:** Concomitant use can lead to serotonin syndrome, a potentially fatal condition. Avoid use within 14 days of MAO inhibitors. * **Serotonergic Agents (e.g., SSRIs, SNRIs, triptans, tramadol):** Increased risk of serotonin syndrome. * **CYP2D6 Inhibitors (e.g., fluoxetine, paroxetine, quinidine):** Can increase dextromethorphan plasma concentrations, increasing the risk of toxicity. * **Alcohol and CNS Depressants:** Additive CNS depression. ## Monitoring Monitor for efficacy (cough suppression) and adverse effects, particularly CNS effects and signs of serotonin syndrome if co-administered with other serotonergic agents. ## Clinical Pearls * Dextromethorphan is often found in combination cold products; ensure other ingredients are appropriate for the patient. * Higher than recommended doses can lead to hallucinogenic effects and abuse potential. * Be aware of potential for serotonin syndrome, especially in patients taking multiple serotonergic medications. *** *Disclaimer: This information is intended for clinical use and does not replace official prescribing information. Always consult the most current drug labeling and relevant clinical guidelines for complete and up-to-date information.*