How Long Does It Take for Dulera to Start Working vs Symbicort?
- Elizabeth Chernoby
- Jul 2
- 5 min read
Updated: 4 days ago
Updated: 02/07/2026| 6 min read
Written by Elizabeth Chernoby in Theskymeds Team
Editorially reviewed by Jonathan Reed, Medical Content Reviewer on 02/07/2026
Introduction
Many people expect a prescription inhaler to work instantly. In reality, maintenance inhalers like Dulera and Symbicort are designed to control inflammation over time while also helping relax the muscles around your airways. Although you may notice easier breathing within minutes of taking a dose, the full benefits often take days or even weeks of consistent use.
Understanding the difference between fast symptom relief and long-term asthma control can help set realistic expectations and improve treatment success. This article compares how quickly Dulera and Symbicort begin working, when you'll likely feel the biggest improvements, and what factors may affect your results.
Key Takeaways
Dulera and Symbicort both begin relaxing airway muscles within about 5–15 minutes.
Neither inhaler should replace a rescue inhaler during a severe asthma attack unless specifically instructed by your healthcare provider.
Maximum improvement usually develops over several days to a few weeks.
Consistent daily use is essential for controlling airway inflammation.
Individual response depends on asthma severity, inhaler technique, and treatment adherence.
What Are Dulera and Symbicort?
Both Dulera and Symbicort are combination inhalers used to manage asthma. Symbicort is also approved for certain people with chronic obstructive pulmonary disease (COPD).
Each contains two types of medication:
An inhaled corticosteroid that reduces inflammation.
A long-acting beta2-agonist (LABA) that relaxes airway muscles.
The steroid addresses the underlying inflammation, while the LABA provides quicker airway relaxation, making breathing easier soon after inhalation.
How Long Does Dulera Take to Start Working?
Dulera combines mometasone (a corticosteroid) with formoterol (a fast-acting LABA).
Initial Effects
Most people begin experiencing airway relaxation within approximately 5 to 15 minutes after inhaling a dose because of the formoterol component.
However, the steroid portion works more gradually by reducing inflammation inside the lungs.
When Do You Feel Better?
Many patients notice:
Less coughing after several days
Reduced wheezing
Easier breathing during activities
Better nighttime symptom control
Full asthma control often requires 2 to 4 weeks of consistent use.
How Long Does Symbicort Take to Start Working?
Symbicort contains budesonide and formoterol.
Since it also contains formoterol, its bronchodilator effect starts quickly.
Initial Onset
Many users notice improved airflow within 5 to 15 minutes.
Long-Term Improvement
With regular use, Symbicort helps:
Reduce airway inflammation
Prevent asthma flare-ups
Improve lung function
Reduce nighttime symptoms
Maximum benefit may develop after several weeks of daily treatment.
Dulera vs Symbicort: Side-by-Side Comparison
Feature | Dulera | Symbicort |
Fast bronchodilator | Yes | Yes |
Begins working | About 5–15 minutes | About 5–15 minutes |
Contains formoterol | Yes | Yes |
Steroid ingredient | Mometasone | Budesonide |
Long-term control | Yes | Yes |
COPD indication | No | Yes (approved in many regions) |
Why Do They Work Quickly but Still Take Weeks?
This is one of the biggest misconceptions.
The fast improvement comes from formoterol relaxing airway muscles.
The slower improvement comes from reducing inflammation.
Think of it like this:
The bronchodilator opens the airway today.
The steroid helps heal inflamed airways over the coming weeks.
Both actions are important for lasting asthma control.
Which One Works Faster?
For most patients, there is no meaningful difference in how quickly Dulera and Symbicort begin opening the airways because both contain formoterol.
Differences between the two medications are usually related to:
Individual response
Steroid formulation
Prescribing preferences
Insurance coverage
Underlying lung condition
Your healthcare provider chooses the inhaler based on your medical history rather than speed alone.
Factors That Affect How Quickly They Work
Several things influence how soon you'll notice improvement.
1. Proper Inhaler Technique
Incorrect inhaler use can prevent medicine from reaching your lungs.
Ask your healthcare provider to review your technique regularly.
2. Consistency
Skipping doses delays inflammation control.
Daily use provides the greatest benefit.
3. Severity of Asthma
People with more severe airway inflammation may require more time before symptoms noticeably improve.
4. Smoking
Smoking damages the airways and may reduce the effectiveness of inhaled corticosteroids.
5. Other Medical Conditions
Conditions such as allergies, sinus disease, or respiratory infections can also affect symptom control.
Can They Be Used During an Asthma Attack?
This is an important safety question.
Although formoterol acts quickly, Dulera is not approved as a rescue inhaler for sudden asthma attacks.
Depending on your treatment plan and local prescribing guidelines, Symbicort may be used as both a maintenance and reliever therapy for some people with asthma. This approach should only be followed if specifically prescribed by your healthcare provider.
Never change how you use your inhaler without medical advice.
What Should You Expect During the First Month?
Many patients experience a gradual improvement.
Week 1
Easier breathing
Less chest tightness
Reduced wheezing
Weeks 2–3
Better exercise tolerance
Fewer nighttime awakenings
Less frequent coughing
Week 4
Improved asthma control
Better lung function
Fewer flare-ups
Reduced need for rescue medication in many patients
The best results from maintenance inhalers come from consistent daily use—not from waiting until symptoms become severe.
Tips for Getting the Best Results
Take your inhaler exactly as prescribed.
Do not skip doses when you feel better.
Use proper inhaler technique.
Rinse your mouth after each dose to help reduce the risk of oral thrush.
Keep follow-up appointments so your treatment can be adjusted if needed.
Monitor your symptoms and discuss any changes with your healthcare provider.
Conclusion
Both Dulera and Symbicort begin relaxing the airways within about 5 to 15 minutes because they contain formoterol, a fast-acting long-acting bronchodilator. However, their full benefits depend on the corticosteroid component, which reduces airway inflammation over time. Most people notice meaningful improvement over several days, with the greatest benefits appearing after two to four weeks of consistent use.
If you don't notice improvement after using either medication as prescribed, or if your symptoms worsen, contact your healthcare provider promptly. Proper inhaler technique and regular use are just as important as choosing the right medication.
FAQ Section
1. Does Dulera work immediately?
Dulera begins opening the airways within about 5–15 minutes, but full anti-inflammatory benefits take several weeks.
2. Is Symbicort faster than Dulera?
No. Both contain formoterol and generally have a similar onset of action.
3. Can I use Dulera as a rescue inhaler?
No. Dulera is intended as a maintenance inhaler and should not replace a rescue inhaler during sudden asthma symptoms.
4. How long should I keep using these inhalers?
Continue using them exactly as prescribed, even if you feel better, unless your healthcare provider advises otherwise.
5. Why don't I feel better after a few days?
Inflammation can take time to improve. Proper technique, daily use, and follow-up with your healthcare provider are important if symptoms persist.
6. Which inhaler is better for asthma?
Neither is universally better. The right choice depends on your medical history, asthma severity, treatment goals, and your healthcare provider's recommendation.