No, Do Not Use Nasocort and Flonase Together
You should not use both Nasocort (triamcinolone acetonide) and Flonase (fluticasone propionate) simultaneously, as both are intranasal corticosteroids from the same drug class with no evidence supporting benefit from combining two nasal steroids.
Why This Combination Doesn't Make Sense
Both medications work through the same mechanism—delivering corticosteroids directly to nasal tissue to reduce inflammation. Using two intranasal corticosteroids together:
- Provides no additional therapeutic benefit beyond using one agent alone
- Increases your total corticosteroid exposure without improving symptom control
- Raises the risk of side effects including nosebleeds, nasal irritation, and potential systemic absorption effects
- Wastes money on redundant therapy
The FDA labels for both medications 1, 2 warn about using steroid medicines together and emphasize telling your doctor about all steroid medications you're taking, including those for asthma, allergies, or skin rash.
What the Evidence Actually Supports
The 2017 Joint Task Force guidelines 3 extensively studied combination therapy for allergic rhinitis and found that:
- Intranasal corticosteroids are the most effective single medication class for controlling allergic rhinitis symptoms
- Combining an intranasal corticosteroid with an intranasal antihistamine (like azelastine) provides clinically meaningful additional benefit for moderate-to-severe symptoms
- No evidence exists for combining two different intranasal corticosteroids
Studies comparing triamcinolone acetonide versus fluticasone propionate 4 demonstrated they are essentially equivalent in efficacy—both reduced nasal symptom scores by approximately 8 points with no significant difference between them.
What You Should Do Instead
Choose one intranasal corticosteroid (either Nasocort or Flonase—they work equally well) and use it consistently:
- Use daily for best results, as intranasal corticosteroids work best with regular use 5
- Effects begin within 12 hours, with full benefit by 1 week 3
- If symptoms remain inadequately controlled after 7 days on a single nasal steroid, consider adding an intranasal antihistamine (like azelastine) rather than a second corticosteroid 3
Common pitfalls to avoid:
- Don't switch back and forth between different nasal steroids expecting better results—they're all similarly effective
- Don't use "as needed"—regular daily use is more effective than intermittent use 5
- Don't add a second nasal steroid if the first isn't working; instead, ensure proper technique and consider adding a different drug class