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## Sinex (oxymetazoline) ### Overview Sinex is a nasal spray containing oxymetazoline, a topical alpha-adrenergic agonist that causes vasoconstriction of nasal mucosa, leading to decongestion. ### Primary Indications Temporary relief of nasal congestion due to the common cold, hay fever, or other upper respiratory allergies. ### Adult Dosing * **Nasal Spray (0.05%):** 2 sprays in each nostril every 10-12 hours as needed. Do not exceed 2 doses in a 24-hour period. ### Pediatric Dosing * **Children 6 to under 12 years:** 1 to 2 sprays in each nostril every 10-12 hours as needed. Do not exceed 2 doses in a 24-hour period. * **Children under 6 years:** Not recommended. Consult a healthcare professional. ### Dose Adjustments No specific dose adjustments are typically required based on renal or hepatic impairment, but caution is advised in patients with cardiovascular disease. ### Contraindications * Hypersensitivity to oxymetazoline or any component of the formulation. * Use within 14 days of discontinuing a monoamine oxidase inhibitor (MAOI) due to risk of hypertensive crisis. ### Adverse Effects Common: Nasal burning, stinging, irritation, sneezing. Less Common: Rhinitis medicamentosa (rebound congestion with prolonged use), increased blood pressure, insomnia, nervousness, headache, nausea. ### Key Drug Interactions * **MAOIs:** Concomitant use or recent discontinuation can lead to hypertensive crisis. * **Other sympathomimetics (e.g., pseudoephedrine, phenylephrine):** May potentiate cardiovascular effects like increased blood pressure and heart rate. ### Monitoring * Monitor for rebound congestion (rhinitis medicamentosa) with prolonged or frequent use. * Monitor blood pressure, especially in patients with pre-existing cardiovascular conditions or those taking MAOIs. ### Clinical Pearls * Limit use to a maximum of 3 consecutive days to avoid rebound congestion. * Prime the pump before first use and if the product has not been used for