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# Tus%252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520qd
## Overview
Tus%252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520qd is a combination product containing dextromethorphan hydrobromide (a cough suppressant) and guaifenesin (an expectorant).
## Primary Indications
* Relief of cough due to minor throat and bronchial irritation.
* Helps loosen phlegm (mucus) and thin bronchial secretions to make coughs more productive.
## Adult Dosing
* **Dextromethorphan/Guaifenesin:** 10-20 mg/100-200 mg orally every 4 hours as needed, or 20 mg/400 mg orally every 12 hours.
* Maximum daily dose for dextromethorphan is generally 120 mg.
* Maximum daily dose for guaifenesin is generally 2400 mg.
## Pediatric Dosing
Dosing varies by age and product formulation. Always refer to specific product labeling for pediatric dosing.
* **Children 6 to under 12 years:** Generally half the adult dose.
* **Children under 6 years:** Use is generally not recommended without physician guidance due to risk of respiratory depression with dextromethorphan.
## Dose Adjustments
* **Hepatic Impairment:** Caution is advised. No specific dose adjustments are established, but reduced doses may be considered.
## Contraindications
* Hypersensitivity to dextromethorphan, guaifenesin, or any component of the formulation.
* Use within 14 days of MAOI therapy or within 14 days of stopping an MAOI.
* Certain drug formulations containing dextromethorphan may be contraindicated in patients with phenylketonuria (due to aspartame).
## Adverse Effects
* **Common:** Dizziness, drowsiness, nausea, vomiting, stomach upset.
* **Less Common/Serious:** Serotonin syndrome (especially with co-administration of other serotonergic agents), respiratory depression (particularly in children or with overdose), confusion, hallucinations, rash, angioedema.
## Key Drug Interactions
* **MAOIs, SSRIs, SNRIs, Tricyclic Antidepressants, other serotonergic drugs:** Increased risk of serotonin syndrome.
* **CNS Depressants (e.g., alcohol, benzodiazepines, opioids):** Increased risk of sedation and respiratory depression.
* **CYP2D6 Inhibitors:** May increase dextromethorphan levels, increasing the risk of adverse effects.
## Monitoring
* Monitor for cough relief and sputum production.
* Assess for adverse effects, particularly sedation, dizziness, and signs of serotonin syndrome.
## Clinical Pearls
* Dextromethorphan can cause psychoactive effects at supra-therapeutic doses.
* Guaifenesin is most effective when adequate fluid intake is maintained.
* The risk of respiratory depression with dextromethorphan is higher in children and with overdose.
* Avoid combination products if only one component is needed.
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**Disclaimer:** This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always verify the most current prescribing information and consult with a qualified healthcare provider before making any treatment decisions. Dosing and recommendations may vary based on individual patient factors and local protocols.
