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# Tus%25252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520qd
## Overview
Tus%25252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520qd is a combination product containing dextromethorphan, guaifenesin, and phenylephrine. Dextromethorphan is a cough suppressant. Guaifenesin is an expectorant that thins mucus. Phenylephrine is a decongestant.
## Primary Indications
* Symptomatic relief of cough and congestion associated with the common cold, allergies, or other respiratory conditions.
## Adult Dosing
* **Oral:** Typically 10 mL or 20 mL every 4 to 6 hours as needed. Maximum daily dose is generally 120 mL per 24 hours. Specific dosing may vary by product formulation and local protocol.
## Pediatric Dosing
* **Children 6 to <12 years:** Typically 5 mL every 4 to 6 hours as needed. Maximum daily dose is generally 60 mL per 24 hours.
* **Children < 6 years:** Use is generally not recommended due to lack of established safety and efficacy. Consult a pediatrician.
## Dose Adjustments
* No specific dose adjustments are routinely recommended for renal or hepatic impairment, but caution and potentially reduced frequency or dose may be considered based on clinical judgment.
## Contraindications
* Hypersensitivity to any component of the formulation.
* Use within 14 days of MAOI therapy.
* Severe hypertension or coronary artery disease (due to phenylephrine).
* Neonates and premature infants (for phenylephrine).
## Adverse Effects
* **Dextromethorphan:** Drowsiness, dizziness, nausea, vomiting, constipation, confusion.
* **Guaifenesin:** Nausea, vomiting, dizziness, headache.
* **Phenylephrine:** Increased blood pressure, headache, nervousness, insomnia, palpitations, dizziness.
## Key Drug Interactions
* **MAOIs:** Risk of hypertensive crisis. Avoid concurrent use or within 14 days of MAOI discontinuation.
* **SSRIs/SNRIs:** Increased risk of serotonin syndrome with dextromethorphan.
* **Beta-blockers:** May reduce the hypotensive effects of beta-blockers and increase the risk of hypertension.
* **Antihypertensives:** Phenylephrine can antagonize the effects of antihypertensive medications.
## Monitoring
* Monitor for effectiveness of cough suppression and decongestion.
* Assess for adverse effects, particularly drowsiness, dizziness, and cardiovascular effects (e.g., elevated blood pressure, palpitations) with phenylephrine.
## Clinical Pearls
* This is a combination product; consider the individual components and their indications and side effects when prescribing.
* Ensure the patient is not taking other medications containing dextromethorphan, guaifenesin, or phenylephrine to avoid overdose.
* Recommend adequate fluid intake to help thin mucus when using guaifenesin.
* Use with caution in patients with underlying cardiovascular conditions, diabetes, thyroid disease, or glaucoma.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional guidelines before making any clinical decisions. Drug formulations and recommendations can change.
