Tus%252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520qd

## Overview Tus%252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520qd is a combination medication containing dextromethorphan hydrobromide (a cough suppressant) and guaifenesin (an expectorant). ## Primary Indications * Symptomatic relief of cough and to help loosen mucus (congestion) associated with the common cold, bronchitis, or other breathing illnesses. ## Adult Dosing * **Tus%252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520qd Extended Release Capsules:** Typically 1 capsule every 12 hours. * **Tus%252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520qd Syrup/Liquid:** Dosing varies by concentration. A common adult dose is 10-20 mL every 4 hours as needed, or 10-20 mL every 6-8 hours for extended-release formulations. Always check product label for specific concentration and dosing. Maximum daily dose depends on product formulation; consult product labeling. ## Pediatric Dosing * **Tus%252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520qd Extended Release Capsules:** Not recommended for use in children under 12 years of age without physician guidance. * **Tus%252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520qd Syrup/Liquid:** Dosing is weight-based or age-based and depends on the specific product concentration. For example, for products with 10 mg dextromethorphan/100 mg guaifenesin per 5 mL: * 6-11 years: 5 mL every 4 hours. * 2-5 years: 2.5 mL every 4 hours. * Under 2 years: Use is not recommended unless directed by a healthcare provider. Always consult the specific product label or a pediatrician for appropriate dosing. ## Dose Adjustments * No specific dose adjustments are typically required for renal or hepatic impairment, but caution is advised and patients should be monitored for adverse effects. Dextromethorphan is metabolized by CYP2D6, and individuals with poor CYP2D6 metabolizer status may experience increased effects and toxicity. ## Contraindications * Hypersensitivity to dextromethorphan or guaifenesin. * Concurrent use with MAO inhibitors or within 14 days of discontinuing MAO inhibitors. * Use in children under 2 years of age for liquid formulations unless directed by a healthcare provider. * Asthma, emphysema, chronic bronchitis, persistent cough, or cough accompanied by excessive phlegm, unless directed by a healthcare provider. ## Adverse Effects * **Common:** Drowsiness, dizziness, nausea, vomiting, stomach upset. * **Less Common/Serious:** Confusion, hallucinations, respiratory depression (especially with overdose or in susceptible individuals), serotonin syndrome (risk increased with concurrent serotonergic agents), allergic reactions. ## Key Drug Interactions * **MAO Inhibitors:** Contraindicated due to risk of serotonin syndrome and hypertensive crisis. * **Serotonergic Agents (e.g., SSRIs, SNRIs, triptans):** Increased risk of serotonin syndrome. * **CNS Depressants (e.g., alcohol, benzodiazepines, opioids):** Additive sedative effects. * **CYP2D6 Inhibitors (e.g., fluoxetine, paroxetine, quinidine):** May increase dextromethorphan plasma concentrations, leading to increased risk of toxicity. ## Monitoring * Monitor for signs and symptoms of serotonin syndrome. * Assess cough and sputum production. * Monitor for CNS effects such as drowsiness, dizziness, or confusion. ## Clinical Pearls * Extended-release formulations should not be crushed or chewed. * Encourage fluid intake to help thin mucus. * Be aware of the potential for abuse of dextromethorphan at higher doses. * Patients with a persistent or chronic cough, or cough accompanied by fever, rash, or persistent headache, should consult a healthcare provider. *** **Disclaimer:** This information is intended for healthcare professionals. It is essential to consult the most current prescribing information and relevant clinical guidelines before making any treatment decisions. Dosing can vary significantly based on the specific product formulation and patient factors. Always verify with the official drug monograph or product labeling.