Treatment of Pain Associated with Postnasal Drip
Start immediately with a first-generation antihistamine plus decongestant combination (such as dexbrompheniramine with sustained-release pseudoephedrine or azatadine with sustained-release pseudoephedrine) for a minimum of 3 weeks, as this is the most effective evidence-based treatment for postnasal drip-related symptoms regardless of whether the cause is allergic or non-allergic rhinitis. 1, 2
First-Line Treatment Algorithm
- Begin with once-daily dosing at bedtime for the first few days to minimize sedation from first-generation antihistamines, then increase to twice-daily therapy after tolerance develops 1, 2
- Most patients will see improvement in symptoms within days to 2 weeks of initiating therapy, though complete resolution may take several weeks to a few months 1, 2
- Common side effects include dry mouth and transient dizziness, but monitor for more serious effects including insomnia, urinary retention, jitteriness, tachycardia, worsening hypertension, and increased intraocular pressure in glaucoma patients 1
The superiority of first-generation antihistamines over newer non-sedating antihistamines is due to their anticholinergic properties, which provide additional drying effects. 1 Newer-generation antihistamines are ineffective for non-allergic causes of postnasal drip and should be avoided 1, 2
Adding Intranasal Corticosteroids
- If no improvement after 1-2 weeks with the antihistamine-decongestant combination alone, add intranasal corticosteroids such as fluticasone 100-200 mcg daily for a 1-month trial 3, 1, 2
- For confirmed allergic rhinitis, start intranasal corticosteroids immediately alongside the antihistamine-decongestant combination 1
- Intranasal corticosteroids are the most effective monotherapy for allergic rhinitis and are also effective for some forms of non-allergic rhinitis 2, 4
Alternative and Adjunctive Therapies
Ipratropium bromide nasal spray (42 mcg per spray, 2 sprays per nostril 4 times daily) is an effective alternative for patients who don't respond to antihistamine/decongestant combinations or have contraindications such as uncontrolled hypertension or cardiac disease. 1, 2, 4 This provides anticholinergic drying effects without systemic cardiovascular side effects 1, 2
High-volume saline nasal irrigation (150 mL per nostril) twice daily improves symptoms through mechanical removal of mucus, enhanced ciliary activity, and disruption of inflammatory mediators 1, 4
For chronic rhinosinusitis with postnasal drip, consider a minimum of 3 weeks of antibiotics effective against H. influenzae, mouth anaerobes, and S. pneumoniae, combined with 3 weeks of oral antihistamine/decongestant and 5 days of nasal decongestant, followed by 3 months of intranasal corticosteroids 2
Evidence for Specific Conditions
- In post-viral acute rhinosinusitis, nasal corticosteroids significantly reduce major symptom scores including postnasal drip, nasal congestion, and time to symptom improvement compared to placebo 3
- Doxycycline significantly reduced postnasal drip symptom scores at week 2 in patients with chronic rhinosinusitis with nasal polyps, though effects were modest 3
Critical Pitfalls to Avoid
- Never use topical nasal decongestants (oxymetazoline, xylometazoline) for more than 3-5 consecutive days due to the risk of rhinitis medicamentosa (rebound congestion). 1, 4
- Monitor blood pressure after initiating decongestant therapy, as decongestants can worsen hypertension and cause tachycardia 1
- Use oral and topical decongestants with caution in older adults, young children, and patients with cardiac arrhythmia, angina, cerebrovascular disease, hypertension, bladder neck obstruction, glaucoma, or hyperthyroidism 2
- Approximately 20% of patients have "silent" postnasal drip with no obvious throat symptoms, so absence of visible drainage doesn't rule out the diagnosis 1, 4
If Symptoms Persist After 2 Weeks
- Proceed with sequential evaluation for other common causes of chronic symptoms, specifically asthma/non-asthmatic eosinophilic bronchitis and gastroesophageal reflux disease (GERD), as these conditions often coexist with postnasal drip 1
- Initiate empiric therapy with omeprazole 20-40 mg twice daily before meals for at least 8 weeks plus dietary modifications if clinical profile suggests GERD, as postnasal drip can be confused with GERD 1
- Maintain all partially effective treatments rather than discontinuing them prematurely, as upper airway cough syndrome, asthma, and GERD together account for approximately 90% of chronic symptoms in this context 1