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# D Cold ## Overview D Cold is a combination product containing dextromethorphan and chlorpheniramine, typically used for symptomatic relief of cough and cold symptoms. Dextromethorphan is a cough suppressant, and chlorpheniramine is an antihistamine with anticholinergic properties. ## Primary Indications Symptomatic relief of cough and cold symptoms, including runny nose and sneezing. ## Adult Dosing * **Dextromethorphan:** 10-20 mg every 4 hours, or 30 mg every 6-8 hours. Maximum daily dose: 120 mg. * **Chlorpheniramine:** 4 mg every 4-6 hours. Maximum daily dose: 24 mg. * Specific product dosing may vary; refer to the individual product labeling. ## Pediatric Dosing Dosing varies significantly by age and product formulation. * **Children 6 to under 12 years:** Dextromethorphan 5-10 mg every 4 hours, or 15 mg every 6-8 hours. Chlorpheniramine 2 mg every 4-6 hours. * **Children 2 to under 6 years:** Dextromethorphan 2.5-5 mg every 4 hours, or 7.5 mg every 6-8 hours. Chlorpheniramine 1 mg every 4-6 hours. * **Children under 2 years:** Safety and efficacy not established. Use with caution and under medical supervision. Dosing should be individualized. ## Dose Adjustments * **Hepatic Impairment:** Caution and potential dose reduction may be warranted due to decreased metabolism. Specific guidance is limited; consult clinical resources. * **Renal Impairment:** No specific dose adjustments are typically recommended, but caution is advised. ## Contraindications * Hypersensitivity to dextromethorphan or chlorpheniramine. * Use within 14 days of MAO inhibitors or within 14 days of stopping an MAO inhibitor. * Narrow-angle glaucoma. * Symptomatic prostatic hypertrophy. * Bladder neck obstruction. * Pyloric obstruction. * Concurrent use with certain selective serotonin reuptake inhibitors (SSRIs) or serotonin-norepinephrine reuptake inhibitors (SNRIs) due to risk of serotonin syndrome. ## Adverse Effects * **Common:** Drowsiness, dizziness, dry mouth, blurred vision, nausea, confusion. * **Less Common/Serious:** Respiratory depression (especially with overdose), CNS depression, excitation (paradoxical reaction in children), urinary retention, constipation. Anticholinergic effects can be more pronounced in the elderly. ## Key Drug Interactions * **MAO Inhibitors:** Risk of severe hypertension, fever, and seizures. * **CNS Depressants (e.g., alcohol, benzodiazepines, opioids):** Potentiated CNS depression. * **SSRIs/SNRIs:** Increased risk of serotonin syndrome. * **Anticholinergic Agents:** Additive anticholinergic effects. * **CYP2D6 Inhibitors (e.g., fluoxetine, paroxetine, quinidine):** May increase dextromethorphan plasma concentrations, increasing risk of toxicity. ## Monitoring * Monitor for effectiveness of cough suppression and reduction in cold symptoms. * Assess for signs of CNS depression or excitation, especially in pediatric patients. * Monitor for adverse effects such as drowsiness, dizziness, dry mouth, and urinary retention. ## Clinical Pearls * D Cold is for symptomatic relief only and does not treat the underlying cause of cough or cold. * Avoid use in patients with chronic cough (e.g., asthma, emphysema) unless directed by a physician. * Dextromethorphan carries a risk of abuse and dependence, particularly in higher doses or specific formulations. * Chlorpheniramine can cause significant drowsiness; advise patients to avoid operating heavy machinery or driving until they know how the medication affects them. * The combination may not be appropriate for very young children due to potential for adverse effects. *** **Disclaimer:** This information is intended for healthcare professionals and does not replace a thorough review of the current prescribing information, clinical guidelines, or professional judgment. Always verify the most up-to-date drug information with the official product labeling and relevant medical literature before making any treatment decisions.