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# Tus-QD (Chlorpheniramine/Dextromethorphan/Phenylephrine)
## Overview
Tus-QD is a combination product typically formulated as an extended-release suspension or liquid. It contains an antihistamine (chlorpheniramine), a cough suppressant (dextromethorphan), and a nasal decongestant (phenylephrine).
## Primary Indications
Symptomatic relief of cough, nasal congestion, and upper respiratory symptoms associated with common cold or allergic rhinitis.
## Adult Dosing
* **Standard Dose:** 10 mL orally every 12 hours.
* **Maximum Dose:** Do not exceed 20 mL in a 24-hour period.
## Pediatric Dosing
* **Children 6 to 12 years:** 5 mL orally every 12 hours.
* **Children under 6 years:** Not recommended without direct provider supervision due to safety concerns regarding OTC cough and cold products in young children.
## Dose Adjustments
* **Renal/Hepatic Impairment:** No formal dosage adjustments provided; use with caution. Consult local institutional guidelines if patient has significant impairment.
* **Geriatric:** Start at the lower end of the dosing range; higher sensitivity to anticholinergic side effects (sedation, urinary retention).
## Contraindications
* Hypersensitivity to any component.
* Concomitant use of monoamine oxidase inhibitors (MAOIs) or use within 14 days of MAOI discontinuation.
* Severe hypertension or severe coronary artery disease.
* Narrow-angle glaucoma.
## Adverse Effects
* **Common:** Drowsiness, dizziness, dry mouth, throat, or nose.
* **Serious:** Paradoxical CNS excitation (especially in children), tachycardia, palpitations, hypertension, urinary retention, and blurred vision.
## Key Drug Interactions
* **MAOIs:** Risk of hypertensive crisis or serotonin syndrome.
* **CNS Depressants:** Increased sedation when combined with alcohol, benzodiazepines, or opioids.
* **Antihypertensives:** Phenylephrine may diminish the therapeutic effect of antihypertensive medications.
## Monitoring
* Monitor blood pressure and heart rate, especially in patients with pre-existing cardiovascular conditions.
* Assess for excessive sedation or urinary symptoms.
## Clinical Pearls
* **Formulation:** Ensure the patient understands this is an extended-release liquid and must not be crushed, chewed, or dosed more frequently than every 12 hours.
* **Overdose Risk:** Monitor total daily intake if the patient is using other OTC multisymptom cold products; many contain acetaminophen or overlapping decongestants.
* **Driving:** Caution patients regarding impaired alertness; do not operate heavy machinery until effects are known.
* **Uncertainty:** Specific product concentrations can vary by manufacturer; always verify the exact concentration (mg/mL) on the patient's specific prescription bottle.
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**Educational Disclaimer:** This information is for educational purposes only. Clinical practice varies based on local protocols, patient-specific factors, and changing evidence. Always verify current prescribing information, package inserts, and drug databases (e.g., Lexicomp, Clinical Pharmacology) before prescribing or administering medication.
