Yes, you can use Flonase (fluticasone propionate) and azelastine nasal sprays together
For adults with moderate-to-severe allergic rhinitis, combining fluticasone propionate (Flonase) with azelastine nasal spray is not only safe but may provide superior symptom control compared to using either medication alone. 1
Evidence Supporting Combination Therapy
The 2017 Joint Task Force on Practice Parameters specifically addressed this question and found that combination therapy with an intranasal corticosteroid and intranasal antihistamine provides clinically meaningful additional benefit for patients aged 12 years and older with moderate-to-severe seasonal allergic rhinitis 1.
Key Findings from Clinical Trials
Five major trials since 2008 demonstrated that fluticasone propionate plus azelastine:
- Reduced nasal symptom scores by 5.31-5.7 points (on a 0-24 scale) compared to 3.84-5.1 for fluticasone alone, 3.25-4.54 for azelastine alone, and 2.2-3.03 for placebo 1
- Provided greater than 40% relative improvement over either agent used alone 1
- Showed the greatest symptom reduction in all four comparative studies, with consistent superiority over monotherapy 1
The combination can be administered either as:
- Two separate commercial sprays (fluticasone propionate + azelastine administered separately) 1
- A single combination device (available as Dymista, containing 137 μg azelastine + 50 μg fluticasone per spray) 2
When to Use Combination Therapy
Consider combination therapy when:
- Initial monotherapy with intranasal corticosteroid fails to adequately control symptoms 3
- Patient has moderate-to-severe allergic rhinitis requiring more aggressive initial treatment 1
- Rapid symptom relief is needed (azelastine provides faster onset than corticosteroids alone) 3, 2
- Patient has mixed rhinitis (both allergic and vasomotor components) 3
Safety Profile
The combination is well-tolerated with minimal adverse events 1:
- Dysgeusia (bitter taste): Most common side effect, occurring in 2.1-13.5% of patients 1
- Somnolence: Rare, occurring in only 0.4-1.1% of patients (similar to placebo rates) 1
- Epistaxis: Rates similar to or lower than placebo groups 1
- No significant systemic effects in adults when used at recommended doses 3
Dosing Considerations
If using separate sprays:
- Fluticasone propionate: 1-2 sprays per nostril once daily
- Azelastine: 1-2 sprays per nostril twice daily 1
If using combination spray (Dymista):
- 1 spray per nostril twice daily (for patients ≥12 years) 2
Important Caveat About Timing
The 2008 guidelines noted that "inadequate data about optimal interval between administration of the 2 sprays" exists when using separate devices 3. However, this does not preclude their concurrent use—it simply means the exact timing between sprays hasn't been rigorously studied.
Clinical Reasoning
The superior efficacy of combination therapy stems from complementary mechanisms:
- Azelastine provides rapid H1-receptor antagonism with onset within hours 3, 2
- Fluticasone propionate provides potent anti-inflammatory effects, though onset typically occurs within 12 hours to several days 3
This dual action addresses both early-phase and late-phase allergic responses more comprehensively than monotherapy 4, 5.
Strength of Recommendation
While the 2017 Joint Task Force graded this as a weak recommendation 1, this reflects methodological concerns about study design (lack of add-on therapy studies, potential bias) rather than lack of efficacy. The clinical benefit is clear and clinically meaningful 1.
Bottom line: The combination is evidence-based, safe, and more effective than either agent alone for moderate-to-severe allergic rhinitis in adults.