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# D-Cold ## Overview D-Cold is a combination product containing **dextromethorphan** (a cough suppressant) and **doxylamine** (an antihistamine with sedative properties). Other ingredients may be present in various formulations, but these are the primary active components for cough and cold symptom relief. ## Primary Indications * Temporary relief of cough due to minor throat and bronchial irritation. * Temporary relief of runny nose and sneezing associated with the common cold. ## Adult Dosing * **Dextromethorphan:** 10 mg to 30 mg every 4 to 12 hours as needed. Maximum daily dose is typically 120 mg. * **Doxylamine:** 25 mg at bedtime or every 4 to 6 hours as needed. Specific dosing for D-Cold products will vary based on the exact formulation and concentration of each ingredient. Always refer to the product labeling for precise dosage instructions. ## Pediatric Dosing * **Dextromethorphan:** * **6 to 12 years:** 15 mg every 4 to 12 hours as needed. Maximum daily dose is typically 60 mg. * **Under 6 years:** Dosing is generally not recommended due to increased risk of adverse effects and lack of established safety/efficacy. Consult a pediatrician. * **Doxylamine:** Not generally recommended for children under 12 years of age unless specifically directed by a healthcare provider. Safety and efficacy have not been established in this age group for over-the-counter use. ## Dose Adjustments * **Hepatic Impairment:** Use with caution. Dextromethorphan and doxylamine are metabolized in the liver. Dose reduction may be necessary, but specific guidelines are not well established for this combination. * **Renal Impairment:** No specific dose adjustments are typically recommended for mild to moderate renal impairment, but caution is advised. ## Contraindications * Hypersensitivity to dextromethorphan or doxylamine. * MAOI inhibitor therapy or within 14 days of discontinuing MAOI therapy (risk of hypertensive crisis with dextromethorphan). * Acute asthma attacks. * Narrow-angle glaucoma (doxylamine). * Inability to urinate spontaneously (doxylamine). * Newborn or premature infants (doxylamine). ## Adverse Effects * **Dextromethorphan:** Drowsiness, dizziness, confusion, nausea, vomiting, constipation. High doses can cause respiratory depression, hallucinations, and euphoria. * **Doxylamine:** Sedation, drowsiness, dry mouth, blurred vision, urinary retention, constipation, dizziness. Paradoxical excitation can occur, especially in children. ## Key Drug Interactions * **MAO Inhibitors:** Concomitant use with dextromethorphan can lead to serotonin syndrome or hypertensive crisis. * **CNS Depressants (e.g., alcohol, benzodiazepines, opioids, sedatives):** Additive CNS depression, increasing risk of sedation, respiratory depression, and impaired coordination. * **CYP2D6 Inhibitors:** May increase dextromethorphan levels, increasing the risk of toxicity. * **Anticholinergic Agents:** Additive anticholinergic effects (dry mouth, blurred vision, urinary retention) with doxylamine. ## Monitoring * Monitor for excessive sedation, confusion, or respiratory depression. * Assess for relief of cough and cold symptoms. * Evaluate for adverse effects, particularly dry mouth, blurred vision, and urinary retention. ## Clinical Pearls * D-Cold products are intended for temporary symptom relief. Consult a healthcare provider if symptoms persist for more than 7 days, recur, or are accompanied by fever, rash, or persistent headache. * Due to the sedative effects of doxylamine, patients should avoid operating heavy machinery or driving until they know how this medication affects them. * Consider the potential for abuse of dextromethorphan at higher than recommended doses. * Read all labels carefully to ensure the product chosen contains only the desired active ingredients and to avoid duplication of therapy. *** *Disclaimer: This information is intended for healthcare professionals and does not replace the need to consult the official prescribing information or other relevant medical literature. Always verify current dosing, indications, and safety information before prescribing or dispensing.*