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# Sinex (oxymetazoline)
## Overview
Oxymetazoline is a topical alpha-adrenergic agonist that causes vasoconstriction of nasal mucosal blood vessels, reducing swelling and congestion.
## Primary Indications
* Nasal congestion due to the common cold, hay fever, or other upper respiratory allergies.
## Adult Dosing
* **Nasal Spray:** Prime the pump before first use. Administer 2 sprays in each nostril every 10-12 hours. Do not exceed 2 applications in a 24-hour period.
## Pediatric Dosing
* **Nasal Spray:** Generally not recommended for children under 6 years of age without physician guidance. For children 6 years and older, follow adult dosing unless otherwise directed by a physician.
## Dose Adjustments
No dose adjustments are typically required based on renal or hepatic impairment for topical nasal use.
## Contraindications
* Hypersensitivity to oxymetazoline or any component of the formulation.
* Use with MAO inhibitors or within 2 weeks of discontinuing MAO inhibitors.
## Adverse Effects
* **Common:** Nasal burning, stinging, dryness, sneezing, transient nasal irritation.
* **Less Common:** Rebound congestion (rhinitis medicamentosa) with prolonged or excessive use, headache, dizziness, insomnia, palpitations.
## Key Drug Interactions
* **MAO Inhibitors:** Can cause hypertensive crisis. Avoid concurrent use.
* **Tricyclic Antidepressants (TCAs):** May potentiate the pressor effects of oxymetazoline. Monitor blood pressure.
* **Beta-blockers:** May blunt the reflex tachycardia associated with oxymetazoline and increase the risk of sustained hypertension.
## Monitoring
* Monitor for signs and symptoms of rebound congestion with prolonged use.
* Monitor blood pressure, especially in patients with cardiovascular disease or those taking concomitant medications that can affect blood pressure.
## Clinical Pearls
* Limit use to a maximum of 3 consecutive days to prevent rebound congestion and tachyphylaxis.
* If congestion is not relieved, consult a healthcare provider.
* Proper technique (spraying away from the septum) can minimize nasal irritation.
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*This information is intended for healthcare professionals and does not substitute for current prescribing information. Always verify the latest product monograph and relevant guidelines.*
