Using an inhaler correctly means breathing in at the right speed, at the right moment, and holding your breath afterward for 5 to 10 seconds so the medication reaches deep into your airways. It sounds simple, but studies show that nearly half of users make errors with coordination, breathing, or breath-holding, and those mistakes mean less medicine actually gets where it needs to go. Here’s how to get it right from the start.
Know Which Type of Inhaler You Have
Before you do anything, figure out whether you’re holding a metered-dose inhaler (MDI) or a dry powder inhaler (DPI). They look different and require completely different breathing techniques. An MDI is the classic L-shaped canister that sprays a mist when you press down. A DPI has no spray; instead, you pull the medication out by breathing in hard and fast. Using the wrong breathing technique for your inhaler type is one of the most common reasons the medicine doesn’t work.
You may also have a spacer, which is a hollow tube that attaches to the end of an MDI. Spacers make coordination much easier because they hold the mist in a small chamber, giving you an extra moment to breathe it in. If your doctor gave you one, use it every time.
How to Use a Metered-Dose Inhaler (MDI)
If your inhaler is brand new or hasn’t been used in a while, you’ll need to prime it first. This clears the valve so you get a full dose. Remove the cap and shake the inhaler well for about 5 seconds. Then spray it into the air, away from your face. Repeat the shake-and-spray cycle the number of times listed in your instructions, usually 1 to 4 times depending on the brand. You only need to prime it once when it’s new and again if you haven’t used it for several days.
When you’re ready to take your dose, follow these steps:
- Shake the inhaler for about 5 seconds to mix the medication evenly.
- Breathe out fully. Exhale away from the inhaler so you empty your lungs as much as comfortably possible. Skipping this step is one of the most common mistakes: 46% of DPI users and a similar proportion of MDI users fail to exhale before inhaling.
- Seal your lips around the mouthpiece (or around the spacer if you’re using one).
- Press and breathe in together. Push the canister down while breathing in slowly and steadily through your mouth. This is the hardest part. About 45% of MDI users struggle with this coordination. If you press too early or too late, most of the mist hits the back of your throat instead of reaching your lungs. A spacer eliminates this problem almost entirely.
- Hold your breath for 5 to 10 seconds. This gives the medication time to settle into your airways. Then breathe out gently through your nose or pursed lips.
If you need a second puff, wait 30 to 60 seconds before repeating. Shake the inhaler again before each puff.
How to Use a Dry Powder Inhaler (DPI)
Dry powder inhalers don’t spray anything. The medication sits as a fine powder inside the device, and your breath pulls it into your lungs. That means you need to breathe in fast, deep, and forcefully, which is the opposite of the slow, steady breath used with an MDI.
Each DPI brand has a slightly different loading mechanism. Some require you to twist a base, others need you to slide a lever or click a button to load a dose. About 29% of DPI users make errors during this preparation step, so read the instructions that come with your specific device carefully. Once the dose is loaded:
- Breathe out fully, away from the mouthpiece (moisture from your breath can clump the powder).
- Seal your lips around the mouthpiece.
- Breathe in fast and deep. Take the biggest, most forceful breath you can through your mouth. Unlike an MDI, there’s no button to press. Your breath is the mechanism that releases the medicine.
- Hold your breath for 5 to 10 seconds, then exhale gently.
Never shake a DPI, and never exhale into it. Both can ruin the dose before you inhale it.
Rescue Inhalers vs. Controller Inhalers
If you’ve been prescribed two inhalers, one is likely a rescue inhaler and the other a controller. They serve very different purposes, and knowing the difference will prevent a lot of confusion.
Rescue inhalers work within a few minutes and last about 4 to 6 hours. You use them only when you’re actively having symptoms like wheezing, tightness, or shortness of breath. Controller inhalers, on the other hand, take days to weeks of consistent daily use before they start working. They reduce inflammation over time and prevent symptoms from happening in the first place. Skipping your controller because “it doesn’t seem to do anything” is a common trap for new users. It’s working behind the scenes, but only if you take it every day as prescribed.
Rinse Your Mouth After Steroid Inhalers
If your inhaler contains a corticosteroid (most controller inhalers do), rinse your mouth with water, gargle, and spit after every use. Steroid particles that linger in your mouth and throat can cause oral thrush, a fungal infection that shows up as white patches and soreness. They can also leave you with a hoarse voice or sore throat. A quick rinse takes 10 seconds and prevents all of this. You don’t need to rinse after using a rescue inhaler.
How to Tell If Your Inhaler Is Running Low
Many newer inhalers have a built-in dose counter, a small number window that counts down each time you use it. Check this number regularly and get a refill when it’s getting close to zero. Some brands display the counter in red when you’re running low.
If your inhaler doesn’t have a dose counter, don’t rely on shaking it to guess how much is left, even though roughly 70% of patients do exactly this. MDIs contain a propellant that continues to spray long after the actual medication runs out. Studies have found that an MDI can fire up to 86 “empty” puffs of propellant with no medicine in them. It will feel and sound the same, but you’re getting nothing. The most reliable approach without a counter is to track the date you started using it, divide the total number of doses listed on the label by how many puffs you take per day, and calculate when it will run out.
Getting Comfortable With the Process
The first few times you use an inhaler, practice the breathing steps without pressing the canister (for an MDI) or loading a dose (for a DPI). This lets you get comfortable with the rhythm of exhaling fully, sealing your lips, and breathing in at the right speed without wasting medication. Once the sequence feels natural, do it for real.
If you’re unsure whether the medicine is reaching your lungs, a few clues can help. With an MDI, if you taste a lot of the medication on your tongue or see mist escaping around your mouth, the timing is off. With a DPI, if you see powder left in the mouthpiece after inhaling, your breath wasn’t forceful enough. At your next appointment, ask your pharmacist or doctor to watch you use your inhaler. Even experienced users develop subtle bad habits over time, and a quick technique check can make a real difference in how well the medication works.