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# Tus%252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520qd
## Overview
Tus%252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520qd is a combination product containing dextromethorphan and guaifenesin. Dextromethorphan is a cough suppressant, and guaifenesin is an expectorant.
## Primary Indications
* Symptomatic relief of cough associated with common cold, bronchitis, and other respiratory conditions.
* Helps loosen mucus and thin bronchial secretions.
## Adult Dosing
* **Dextromethorphan:** Typically 10-20 mg every 4 hours, or 30 mg every 6-8 hours. Maximum 120 mg/day.
* **Guaifenesin:** Typically 200-400 mg every 4 hours. Maximum 2400 mg/day.
* Specific dosing for combination products varies by formulation and manufacturer. Always refer to the product label.
## Pediatric Dosing
* **Dextromethorphan:**
* 6 to under 12 years: 5-10 mg every 4 hours, or 15 mg every 6-8 hours. Maximum 60 mg/day.
* Under 6 years: Safety and efficacy not established for over-the-counter use. Consult a healthcare provider.
* **Guaifenesin:**
* 6 to under 12 years: 100-200 mg every 4 hours. Maximum 1200 mg/day.
* Under 6 years: Consult a healthcare provider.
* Combination product dosing in pediatric patients depends on age and specific formulation.
## Dose Adjustments
* **Hepatic Impairment:** Caution is advised. Dextromethorphan is metabolized by the liver. Dose reduction may be necessary.
* **Renal Impairment:** No specific dose adjustments are usually recommended for moderate impairment, but caution is advised.
## Contraindications
* Hypersensitivity to dextromethorphan or guaifenesin.
* Use within 14 days of MAOI therapy (for dextromethorphan).
* Severe hepatic impairment.
* Children under a specified age (often 4 or 6 years, depending on product labeling and regulatory guidance for OTC cough and cold products).
## Adverse Effects
* **Common:** Drowsiness, dizziness, nausea, vomiting, stomach upset.
* **Less Common:** Confusion, restlessness, excitation, rash.
* **Dextromethorphan (at higher doses or overdose):** Hallucinations, respiratory depression, serotonin syndrome (especially with concurrent serotonergic agents).
## Key Drug Interactions
* **Monoamine Oxidase Inhibitors (MAOIs):** Risk of serotonin syndrome or hypertensive crisis with dextromethorphan.
* **Serotonergic Agents (e.g., SSRIs, SNRIs, triptans, tramadol):** Increased risk of serotonin syndrome with dextromethorphan.
* **Central Nervous System (CNS) Depressants (e.g., alcohol, sedatives, benzodiazepines):** Additive CNS depression.
* **CYP2D6 Inhibitors (e.g., fluoxetine, paroxetine, quinidine):** May increase dextromethorphan levels, leading to increased toxicity.
## Monitoring
* Effectiveness of cough suppression and expectoration.
* Signs of adverse effects, particularly drowsiness, dizziness, nausea, and confusion.
* Signs of serotonin syndrome if concurrent serotonergic agents are used.
## Clinical Pearls
* This product is intended for symptomatic relief. It does not treat the underlying cause of the cough.
* Hydration is important when using guaifenesin to help thin secretions.
* Dextromethorphan has a potential for abuse; use as directed.
* Always check the specific formulation for exact strengths and dosing instructions, especially for combination products.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant guidelines before making clinical decisions. Dosing may vary based on specific product formulation, patient factors, and local protocols.*
