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# Oxymetazoline (Sinex) ## Overview Oxymetazoline is a topical decongestant that acts as an alpha-adrenergic agonist. It causes vasoconstriction of the nasal mucosa, reducing swelling and congestion. ## Primary Indications * Nasal congestion due to the common cold, hay fever, or other upper respiratory allergies. ## Adult Dosing * **Nasal Spray:** 2 sprays in each nostril every 10-12 hours as needed. * **Maximum Duration:** Do not use for more than 3 consecutive days to avoid rebound congestion (rhinitis medicamentosa). ## Pediatric Dosing * **Children 6 to under 12 years:** 1 to 2 sprays in each nostril every 10-12 hours as needed. * **Children under 6 years:** Safety and efficacy have not been established. Consult with a pediatrician. ## Dose Adjustments No specific dose adjustments are typically required for renal or hepatic impairment, but caution is advised in patients with pre-existing conditions that could be exacerbated by systemic absorption. ## Contraindications * Hypersensitivity to oxymetazoline or any component of the formulation. * Patients receiving MAO inhibitors or within 2 weeks of discontinuing MAO inhibitors. ## Adverse Effects * **Common:** Nasal discomfort, burning, stinging, dryness, sneezing. * **Less Common/Serious:** Rebound congestion (rhinitis medicamentosa) with prolonged use, systemic effects such as increased blood pressure, palpitations, nervousness, insomnia. ## Key Drug Interactions * **MAO Inhibitors:** Concurrent use or recent discontinuation can lead to hypertensive crisis. * **Other Sympathomimetics:** May potentiate cardiovascular effects. ## Monitoring * Monitor for rebound congestion with prolonged use. * Monitor blood pressure and heart rate if systemic absorption is suspected, particularly in patients with cardiovascular disease. ## Clinical Pearls * Limit use to a maximum of 3 days to prevent rhinitis medicamentosa. * If congestion does not improve or worsens, discontinue use and consult a healthcare provider. * Systemic absorption is possible, especially with overuse or in sensitive individuals. *** _Always verify current prescribing information and local protocols before administering or recommending medication._