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# TUSQ D
## Overview
TusQ D is a combination product containing **Dextromethorphan** (a cough suppressant) and **Guaifenesin** (an expectorant).
## Primary Indications
* Symptomatic relief of cough associated with the common cold, bronchitis, or other respiratory conditions.
* Aids in loosening mucus (g/**uaifenesin**).
## Adult Dosing
* **Dextromethorphan:** 10 mg to 20 mg every 4 hours, or 30 mg every 6 to 8 hours.
* Maximum Dextromethorphan: 120 mg per 24 hours.
* **Guaifenesin:** 200 mg to 400 mg every 4 hours.
* Maximum Guaifenesin: 2400 mg per 24 hours.
*Specific dosing for TusQ D will depend on the product formulation (e.g., syrup, tablet, extended-release). Always refer to the product label or specific prescribing information.*
## Pediatric Dosing
* **Dextromethorphan:**
* Children 6 to 12 years: 5 mg to 10 mg every 4 hours, or 15 mg every 6 to 8 hours.
* Maximum: 60 mg per 24 hours.
* Children 2 to 6 years: Dosing is not routinely recommended; consult a pediatrician. If used, typically 2.5 mg to 5 mg every 4 hours, or 7.5 mg every 6 to 8 hours.
* Maximum: 30 mg per 24 hours.
* Children under 2 years: Contraindicated.
* **Guaifenesin:**
* Children 6 to 12 years: 100 mg to 200 mg every 4 hours.
* Maximum: 1200 mg per 24 hours.
* Children 2 to 6 years: Dosing is not routinely recommended; consult a pediatrician. If used, typically 50 mg to 100 mg every 4 hours.
* Maximum: 600 mg per 24 hours.
* Children under 2 years: Consult a pediatrician.
*Pediatric dosing for combination products like TusQ D is highly dependent on the specific concentration of each active ingredient and is often based on age and weight. Always refer to the product label or specific prescribing information for pediatric use.*
## Dose Adjustments
* **Hepatic Impairment:** Dextromethorphan may require dose reduction or increased dosing interval due to potential for accumulation. Guaifenesin generally does not require dose adjustment in hepatic impairment, but caution is advised.
## Contraindications
* Hypersensitivity to dextromethorphan or guaifenesin.
* Use in children under 2 years of age for dextromethorphan component.
* Concurrent use with MAO inhibitors or within 14 days of stopping MAO inhibitors (dextromethorphan).
* Certain respiratory conditions (e.g., persistent cough, cough with excessive secretions) where suppression may be undesirable.
## Adverse Effects
* **Common (Dextromethorphan):** Dizziness, drowsiness, nausea, vomiting, constipation.
* **Less Common (Dextromethorphan):** Confusion, hallucinations, respiratory depression (at high doses).
* **Common (Guaifenesin):** Nausea, vomiting, dizziness, headache.
* **Less Common (Guaifenesin):** Rash, urticaria.
## Key Drug Interactions
* **MAO Inhibitors:** Risk of serotonin syndrome or severe hypertensive crisis with dextromethorphan.
* **SSRIs/SNRIs/Triptans/Opioids:** Increased risk of serotonin syndrome with dextromethorphan.
* **CNS Depressants (e.g., alcohol, benzodiazepines, sedatives):** Additive CNS depressant effects with dextromethorphan.
* **CYP2D6 Inhibitors (e.g., quinidine, fluoxetine, paroxetine):** May increase dextromethorphan plasma concentrations, increasing risk of adverse effects.
## Monitoring
* Assess cough frequency and severity.
* Monitor for relief of mucus congestion.
* Observe for adverse effects, particularly CNS effects with dextromethorphan.
* Monitor for signs of serotonin syndrome if co-administered with serotonergic agents.
## Clinical Pearls
* Dextromethorphan is an NMDA receptor antagonist and sigma-1 receptor agonist.
* Guaifenesin is thought to increase the volume and reduce the viscosity of secretions in the trachea and bronchi, facilitating their removal by ciliary action and cough.
* Adequate hydration is important when using guaifenesin to help loosen mucus.
* TusQ D is intended for symptomatic relief and does not treat the underlying cause of the cough.
* Discontinue use and consult a healthcare provider if cough persists for more than 7 days, recurs, or is accompanied by fever, rash, or persistent headache.
* Caution with patients with conditions that may be exacerbated by cough suppression (e.g., asthma, emphysema).
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*Disclaimer: This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always verify current prescribing information and consult with a qualified healthcare provider before making any treatment decisions.*
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