If you have asthma, your healthcare provider may prescribe more than one inhaler. One is used to quickly relieve symptoms when you're having trouble breathing, while another is used every day to help prevent symptoms from occurring in the first place.
Understanding the difference between controller inhalers and rescue inhalers is one of the most important parts of managing asthma. Although both are inhalers, they work in very different ways and are used for different purposes. Knowing which inhaler to use—and when to use it—can improve asthma control and reduce your risk of serious asthma attacks.
Why Are There Different Types of Inhalers?
Asthma is a chronic disease that causes inflammation and narrowing of the airways. Two main problems occur in asthma: the muscles around the airways tighten, and the lining of the airways becomes inflamed and swollen.
Rescue inhalers quickly relax the airway muscles, while controller inhalers reduce the inflammation that causes asthma over time. Because they treat different parts of asthma, many people benefit from using both.
What Is a Rescue Inhaler?
A rescue inhaler provides fast relief during asthma symptoms. It works by relaxing the muscles surrounding the airways, allowing them to open within minutes.
Rescue inhalers are used for wheezing, chest tightness, shortness of breath, sudden coughing caused by asthma, and preventing exercise-induced asthma when recommended. Most rescue inhalers begin working within 5 to 15 minutes. They are designed to treat symptoms after they begin.
The most commonly prescribed rescue medication is albuterol. Some people may also use other short-acting bronchodilators depending on their individual treatment plan.
What Is a Controller Inhaler?
A controller inhaler helps prevent asthma symptoms before they occur. Unlike rescue inhalers, controller medications do not provide immediate relief. Instead, they reduce airway inflammation over days to weeks, making asthma attacks less likely.
Controller inhalers are often used every day, even when you feel well, as part of a long-term asthma treatment plan. Skipping controller medication often allows inflammation to gradually return, increasing the risk of future symptoms.
Common Controller Medications
Inhaled corticosteroids (ICS)
These reduce inflammation inside the airways. Examples include medications containing budesonide, fluticasone, beclomethasone, and mometasone. Learn more in our guide to inhaled corticosteroids.
Combination inhalers
These combine an inhaled corticosteroid with a long-acting bronchodilator (LABA). Examples include combinations such as budesonide/formoterol, fluticasone/salmeterol, and fluticasone/vilanterol. These medications help reduce inflammation while keeping the airways open for a longer period.
How Quickly Do They Work?
Rescue inhalers begin working within minutes, relieve symptoms quickly, and their effects usually last 4 to 6 hours.
Controller inhalers do not provide immediate relief, may take several days to begin improving inflammation, and reach maximum benefit over several weeks of regular use.
For this reason, a controller inhaler should never be used in place of a rescue inhaler during sudden breathing difficulty unless your healthcare provider has specifically instructed you to do so — one important exception is SMART therapy, where a specific combination inhaler serves both roles.
Can You Use Only a Rescue Inhaler?
Some people with very mild asthma may only need a rescue inhaler, while others require daily controller medication. If you're using your rescue inhaler more often than recommended, it may be a sign that your asthma is not well controlled. Your healthcare provider may recommend adding or adjusting a controller medication to reduce future symptoms and asthma attacks.
Why Is Daily Controller Use Important?
Many people stop using their controller inhaler once they start feeling better. Unfortunately, asthma inflammation often continues even when symptoms improve.
Taking your controller medication consistently can reduce asthma attacks, improve lung function, decrease nighttime symptoms, reduce the need for rescue medication, improve exercise tolerance, and lower the risk of emergency department visits and hospitalization. The goal is to prevent symptoms—not just treat them after they begin.
What Happens If You Confuse the Two?
Using the wrong inhaler at the wrong time can lead to poor asthma control. Using a controller inhaler during a sudden asthma attack will usually not provide immediate relief. Likewise, relying only on a rescue inhaler without treating underlying inflammation may allow asthma to worsen over time. Many people find it helpful to learn the name, appearance, and purpose of each inhaler they use.
Tips for Managing Multiple Inhalers
- Know which inhaler is your rescue medication and which is your daily controller.
- Keep your rescue inhaler with you whenever possible.
- Take controller medication exactly as prescribed.
- Review inhaler technique regularly.
- Check expiration dates and dose counters.
Bringing all of your inhalers to medical appointments allows your healthcare provider to review your medications and technique.
Frequently Asked Questions
Can I stop my controller inhaler when I feel better?
Do not stop a controller medication without discussing it with your healthcare provider. Symptoms may improve before the underlying airway inflammation has resolved.
Can I use my controller inhaler during an asthma attack?
Most controller inhalers are not intended to provide immediate symptom relief. Follow your asthma action plan and use your rescue medication as directed unless your healthcare provider has given you different instructions.
Why do I need medication every day if I don't have symptoms?
Asthma inflammation can persist even when you feel well. Daily controller medication helps keep that inflammation under control and reduces the risk of future attacks.
Do I need to rinse my mouth after using a controller inhaler?
If your controller inhaler contains an inhaled corticosteroid, rinse your mouth with water and spit it out after each dose. This helps reduce the risk of oral thrush and hoarseness — see why rinsing matters.
Can children use controller inhalers?
Yes. Many children with persistent asthma use controller medications safely under the guidance of their healthcare provider.
When Should You Contact Your Healthcare Provider?
Schedule an appointment if you're using your rescue inhaler more often than recommended, your asthma symptoms are becoming more frequent, you're waking up because of asthma, you are unsure which inhaler to use, or your medications no longer seem to control your symptoms. Regular follow-up helps ensure your treatment plan continues to meet your needs.
Seek Immediate Medical Care If
Call 911 or seek emergency medical care immediately if your rescue inhaler does not relieve severe breathing difficulty, you cannot speak in full sentences because of shortness of breath, your lips or fingernails become blue or gray, you become confused or difficult to awaken, or your breathing rapidly worsens despite using your prescribed rescue medication. These symptoms may indicate a life-threatening asthma attack.
The Bottom Line
Controller and rescue inhalers work together to help manage asthma, but they serve different purposes. Rescue inhalers provide quick relief when symptoms occur, while controller inhalers reduce airway inflammation over time to help prevent symptoms and asthma attacks.
Understanding which inhaler to use, taking your medications as prescribed, and reviewing your inhaler technique regularly are key steps toward keeping asthma well controlled and reducing the risk of serious flare-ups.