Quick Summary
- Asthma preventers are daily medications that treat underlying airway
inflammation. They are different from asthma relievers.
- Many people with asthma benefit from a preventer if symptoms are frequent, affect sleep, or require regular reliever use.
- Even mild asthma can involve ongoing inflammation that a preventer can help manage before symptoms escalate.
- Not sure if you need one? Read this article to find out what the signs are and when to speak with your GP.
Preventers vs Relievers: The Key Distinction
Asthma affects one in nine Australians, yet only 32% of people with asthma have an action plan (National Asthma Council, 2025) – and knowing whether you need a preventer is a key part of that.
Some people have been using a reliever for years without ever being prescribed a preventer. Others are newly diagnosed and unsure where to start. If you have ever wondered whether your current management is enough, you are not alone, and this article is designed to help you find out.
The first step is understanding the difference between a reliever and a preventer. All asthmatics need a reliever, which they can use when their symptoms flare up, whereas preventers are a key part of long-term asthma management. Many people with asthma benefit from the use of a preventer.
What is an asthma preventer?
An asthma preventer is a medication taken regularly to reduce inflammation in the airways. They work to treat the underlying cause of asthma symptoms and, as the name suggests, prevent flare-ups.
However, it is important to note that an asthma preventer does not provide immediate relief. Their objective is to make airways less sensitive, reduce inflammation and clear up mucus in the lungs – and this is also why they’re inhaled, allowing the medication to travel directly to the lungs. Most preventers are inhaled corticosteroids (ICS).
How asthma preventers work
Asthma preventers work by targeting the underlying inflammation in the airways rather than just relieving symptoms in the moment. They assist with the following:
- Reducing airway inflammation – corticosteroids suppress the immune response that causes the airway lining to become swollen and irritated.
- Decreasing sensitivity to triggers – over time, the airways become less reactive to common triggers such as dust, pollen, exercise, or cold air.
- Reducing mucus production – less inflammation means the airways produce less mucus, making it easier to breathe.
- Lowering the risk of asthma attacks – by keeping inflammation under control day to day, preventers reduce the likelihood of a sudden flare-up.
Because their effect builds up gradually, preventers are usually taken every day, even when symptoms are not present. Skipping doses can allow inflammation to return and make the airways more vulnerable to triggers.
What is an asthma reliever?
An asthma reliever is a fast-acting medication used during asthma symptoms when they flare up. Unlike a preventer, a reliever is not taken daily – it is used when you need it.
How asthma relievers work
It works by rapidly relaxing the muscles around the airways, causing them to widen and making it easier to breathe. Most relievers take effect within minutes, which is why they are the go-to response during an asthma episode, which includes experiencing:
- Wheezing
- Chest tightness
- Shortness of breath
- Coughing
The most common type of reliever in Australia is a short-acting beta-agonist (SABA), commonly salbutamol, known as Ventolin. Unlike preventers, relievers do not treat inflammation or long-term asthma control. If you find yourself reaching for your reliever frequently, it may be a sign that your asthma requires more management and is worth discussing with your doctor.
Do you need an asthma preventer?
Not everyone with asthma requires a preventer, but many people benefit from one depending on symptom frequency and severity. The experiences below can help you assess whether it’s worth raising with your GP.
You may benefit from a preventer if you:
- Use your reliever more than twice per week
- Wake at night due to asthma symptoms
- Experience symptoms with exercise or allergies
- Have had recent asthma flare-ups or GP visits
- Notice symptoms affecting daily activities
- Have ongoing or recurring breathing symptoms
It is worth noting that even mild asthma can involve chronic inflammation that builds quietly in the background. A preventer works to address this before symptoms escalate – which is why waiting until symptoms feel serious is not always the right approach.
Frequently asked questions about asthma preventors
Can you have asthma without a preventer?
However, asthma is not a static condition. It can change over time, often gradually and without obvious warning signs. What feels like mild or occasional asthma may still involve underlying inflammation that is quietly affecting the airways, and without regular review, it can be easy to underestimate.
This is why ongoing assessment matters, even when symptoms seem manageable. It is important to ensure that:
- Lung function is stable
- Symptoms are not under-recognised
- Treatment matches current risk level
The goal is not to over-treat, but to make sure that a “wait and see” approach does not leave inflammation unaddressed.
Why are asthma preventers important?
Without regular preventer use, the airways remain vulnerable. Over time, repeated inflammation can make asthma harder to manage and increase the risk of serious flare-ups.
Key benefits include:
- Fewer asthma symptoms over time
- Reduced risk of asthma attacks
- Improved lung function stability
- Less reliance on reliever medication
- Better day-to-day breathing control
Consistency is key. Because preventers build their effect gradually, skipping doses – even on what may feel like a good day – can allow inflammation to creep back and undo progress. Think of a preventer less like a treatment and more like ongoing maintenance for your airways.
When should you seek medical advice?
- Your reliever use is increasing
- Symptoms are affecting sleep or activity
- You are unsure about asthma control
- You have not had a recent asthma review
A clinician can assess your symptoms and determine whether a preventer is appropriate. If you’re unsure, book an appointment with a respiratory specialist via the link below:
https://mansemedical.zedmed-appointments.systems/
