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Tus%25252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525qd is a brand name for **Guaifenesin with Dextromethorphan Hydrobromide**.
## Overview
This combination product is an expectorant and a cough suppressant. Guaifenesin helps loosen mucus in the airways, making coughs more productive. Dextromethorphan is a cough suppressant that acts on the cough center in the brain.
## Primary Indications
* Temporary relief of cough due to minor throat and bronchial irritation associated with the common cold.
* Temporary relief of symptoms of the common cold.
## Adult Dosing
Dosing varies significantly by product formulation (e.g., immediate-release, extended-release, specific strengths). **Consult product labeling for specific dosage instructions.**
A common regimen for **immediate-release** formulations containing 400 mg guaifenesin and 20 mg dextromethorphan per 10 mL or 2 tablets is:
* 10-20 mL or 1-2 tablets every 4 hours as needed.
* Maximum daily dose is typically 6 doses.
Extended-release formulations will have different dosing frequencies.
## Pediatric Dosing
Dosing is weight-based and age-dependent, and **varies significantly by product formulation.** **Always consult product labeling or a reliable pediatric dosing resource.**
**General guidelines (may not apply to all formulations):**
* **Children 6 to under 12 years:** 5 mL or 1 tablet every 4 hours as needed. Maximum 6 doses in 24 hours.
* **Children under 6 years:** Consult a pediatrician. Dextromethorphan is generally not recommended for children under 4 years due to safety concerns and lack of proven efficacy in this age group.
## Dose Adjustments
* **Renal Impairment:** No specific dose adjustments are typically listed, but caution is advised.
* **Hepatic Impairment:** Use with caution, as metabolism may be affected.
## Contraindications
* Hypersensitivity to guaifenesin or dextromethorphan.
* Use with or within 2 weeks of taking a monoamine oxidase inhibitor (MAOI).
* Children under 4 years of age (for dextromethorphan component).
## Adverse Effects
* **Guaifenesin:** Nausea, vomiting, dizziness, headache, rash.
* **Dextromethorphan:** Drowsiness, dizziness, nausea, vomiting, constipation, nervousness, confusion. High doses can lead to central nervous system depression, respiratory depression, and potential for abuse. Serotonin syndrome is a risk, especially when combined with other serotonergic agents.
## Key Drug Interactions
* **MAOIs:** Potentially fatal serotonin syndrome.
* **SSRIs, SNRIs, Triptans, Tramadol, Linezolid, St. John's Wort:** Increased risk of serotonin syndrome.
* **CNS Depressants (e.g., alcohol, benzodiazepines, opioids):** Additive CNS depression.
* **CYP2D6 Inhibitors (e.g., fluoxetine, paroxetine, quinidine):** May increase dextromethorphan levels and risk of toxicity.
## Monitoring
* Effectiveness of cough suppression and mucus expectoration.
* Signs and symptoms of adverse effects, particularly drowsiness, confusion, and signs of serotonin syndrome.
## Clinical Pearls
* Ensure adequate hydration to help guaifenesin work effectively.
* Avoid use in patients with chronic cough, persistent cough, or cough accompanied by excessive phlegm unless directed by a healthcare provider.
* Dextromethorphan can be a drug of abuse; counsel patients on appropriate use.
* Many combination products exist; confirm the exact strengths of guaifenesin and dextromethorphan in the specific product being used.
***
*Disclaimer: This information is for clinical reference only and does not replace the need for professional medical judgment. Always consult the most current prescribing information and relevant guidelines before making any treatment decisions.*
