Revisiting Rhinitis Medicamentosa: Examining the Evidence on Topical Nasal Decongestants.

Over-the-counter topical nasal decongestants are effective and well-tolerated treatments for the temporary relief of nasal congestion, a symptom that can impair quality of life. Their duration of use is limited owing to potential for rhinitis medicamentosa (RM) or rebound congestion (RC), despite uncertainties around the clinical occurrence or onset of these phenomena. To investigate the clinical occurrence and onset of RM, RC or tolerance with topical nasal decongestants to inform evidence-based recommendation practices for pharmacists and ensure patients do not forego potentially beneficial treatments. A literature search was conducted with ProQuest to identify and synthesize evidence on RM, RC or tolerance with nasal decongestant sprays or drops. A respiratory specialist and community pharmacist provided clinical perspectives. Eighteen articles were assessed, reporting 13 studies with oxymetazoline, five studies with xylometazoline. There was no evidence of RM or RC after 7 days with oxymetazoline (up to 400 μg total daily dose) or up to 10-days with xylometazoline (840 μg total daily dose). Well-designed studies suggested no occurrence of RM, RC or tolerance with up to 4 weeks of oxymetazoline. No studies evaluating naphazoline, phenylephrine or ephedrine were identified. Oxymetazoline and xylometazoline are highly effective at rapidly improving nasal congestion and have well-established safety profiles. Well-designed studies yielded no evidence of RM, RC or tolerance when used short-term at commonly recommended dosing and frequency. Since some patients may exceed the duration of use in the label, pharmacists can play a vital role in counseling patients on proper intranasal decongestant use and treatment duration.