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## Oxymetazoline (Sinex) ### Overview Oxymetazoline is a topical alpha-adrenergic agonist that acts as a nasal decongestant. It causes vasoconstriction of the nasal mucosa, reducing swelling and congestion. ### Primary Indications * Nasal congestion associated with the common cold, allergic rhinitis, or sinusitis. ### Adult Dosing * **Nasal Spray (0.05%):** Instill 2 to 3 sprays in each nostril every 10 to 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 years and older:** 2 to 3 sprays in each nostril every 10 to 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 hepatic or renal impairment due to minimal systemic absorption. ### Contraindications * Hypersensitivity to oxymetazoline or any component of the formulation. * Patients currently taking or who have recently (within 14 days) taken MAO inhibitors. ### Adverse Effects * **Common:** Nasal burning, stinging, dryness, sneezing, increased nasal discharge. * **Less Common/Serious:** Rebound congestion (rhinitis medicamentosa) with prolonged use, hypertension, palpitations, headache, nervousness, insomnia. ### Key Drug Interactions * **MAO Inhibitors:** Concurrent use or recent use can lead to a hypertensive crisis. * **Other Sympathomimetic Agents:** May potentiate systemic effects like increased blood pressure. ### Monitoring * Monitor for signs of rebound congestion with prolonged or excessive use. * Monitor blood pressure, especially in patients with pre-existing hypertension or cardiovascular disease. ### Clinical Pearls * Limit use to a maximum of 3 days to prevent rhinitis medicamentosa. * Proper technique involves a quick spray directed towards the outer wall of the nostril. * If symptoms worsen or do not improve after 3 days, discontinue use and consult a healthcare provider. *** *Disclaimer: This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information and your institution's protocols before making clinical decisions.*