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# TUSQ-QD (TUS%25252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520QD)
## Overview
TUSQ-QD is a combination product containing guaifenesin and dextromethorphan. Guaifenesin is an expectorant, and dextromethorphan is a cough suppressant.
## Primary Indications
* **Guaifenesin:** To help loosen phlegm (mucus) and thin bronchial secretions to make coughs more productive.
* **Dextromethorphan:** To temporarily relieve cough due to the common cold, or other breathing illnesses.
## Adult Dosing
* **Guaifenesin:** Typically 200 mg to 400 mg every 4 hours as needed. Maximum dose is 2400 mg per 24 hours.
* **Dextromethorphan:** Typically 10 mg to 20 mg every 4 hours as needed, or 30 mg every 6 to 8 hours as needed. Maximum dose is 120 mg per 24 hours.
* **TUSQ-QD specific dosing:** Refer to product labeling for specific product strengths and dosing intervals.
## Pediatric Dosing
Dosing varies significantly by age and product formulation. Consult product labeling or specific pediatric guidelines.
* **Guaifenesin:** Generally not recommended for children under 2 years of age. Dosing for children 2-6 years and 6-12 years varies.
* **Dextromethorphan:** Generally not recommended for children under 2 years of age. Dosing for children 2-6 years and 6-12 years varies.
## Dose Adjustments
* **Hepatic Impairment:** No specific recommendations, but caution is advised due to potential for impaired metabolism.
* **Renal Impairment:** No specific recommendations, but caution is advised.
## Contraindications
* Hypersensitivity to guaifenesin or dextromethorphan.
* Use as a sole agent to suppress a persistent cough that may be indicative of a serious condition (e.g., asthma, emphysema) without medical supervision.
* Dextromethorphan is contraindicated in patients currently taking, or within 14 days of stopping, a monoamine oxidase inhibitor (MAOI).
## Adverse Effects
* **Guaifenesin:** Nausea, vomiting, dizziness, rash.
* **Dextromethorphan:** Dizziness, drowsiness, nausea, vomiting, constipation, nervousness. High doses can cause confusion, hallucinations, and respiratory depression. Serotonin syndrome is a risk with concomitant serotonergic drugs.
## Key Drug Interactions
* **Monoamine Oxidase Inhibitors (MAOIs):** Dextromethorphan can cause serious, potentially fatal, reactions including hyperpyrexia, tachycardia, and hypertension when used with MAOIs.
* **Serotonergic Drugs (e.g., SSRIs, SNRIs, tricyclic antidepressants, triptans):** Increased risk of serotonin syndrome.
* **CNS Depressants (e.g., alcohol, sedatives, hypnotics):** Additive CNS depression.
* **CYP2D6 Inhibitors (e.g., quinidine, fluoxetine, paroxetine):** May increase dextromethorphan plasma concentrations.
## Monitoring
* Monitor for effectiveness of cough suppression and expectorant action.
* Monitor for adverse effects, especially CNS effects and signs of serotonin syndrome.
* Assess for signs of underlying respiratory conditions if cough persists.
## Clinical Pearls
* Guaifenesin works best when taken with a full glass of water to help thin secretions.
* Dextromethorphan can cause drowsiness; patients should avoid operating heavy machinery or driving until they know how the drug affects them.
* Advise patients to seek medical attention if cough persists for more than 7 days, recurs, is accompanied by fever, rash, or persistent headache.
* Combination products limit individual titration of each component.
**Disclaimer:** This information is for educational purposes only and does not substitute for professional medical advice. Always consult the current prescribing information or a qualified healthcare provider for definitive drug information, dosing, and patient-specific recommendations.
