Using an inhaler correctly makes a bigger difference than most people realize. With proper technique, over 40% of the medication can reach your lungs. With poor technique, that number can drop below 6%. The device type you have determines the exact steps, but a few fundamentals apply across the board: exhale fully before inhaling, time your breath with the spray, and hold your breath for about 10 seconds afterward.
Metered-Dose Inhalers (MDIs)
The metered-dose inhaler is the most common type, the classic L-shaped device with a pressurized canister that clicks into a plastic actuator. Here’s the full sequence:
- Remove the cap and check the mouthpiece for debris or loose objects.
- Shake the inhaler well for a few seconds.
- Stand or sit up straight.
- Breathe out completely to empty your lungs. This is one of the most critical steps, and skipping it is one of the top reasons inhalers fail to control symptoms.
- Seal your lips tightly around the mouthpiece.
- Press the canister and breathe in simultaneously. As you start to inhale, press down firmly on the top of the canister to release one puff. Continue breathing in slowly for 3 to 5 seconds. Take as deep a breath as possible.
- Hold your breath and count to 10, or as long as you comfortably can.
- Remove the inhaler from your mouth, then exhale slowly.
- Wait 1 minute before taking a second puff, if prescribed. Then repeat the process from the exhale step.
The timing between pressing the canister and breathing in is the trickiest part. Activating the puff during the first half of your inhalation delivers roughly double the medication compared to pressing it too early (before you start breathing in). Pressing before you inhale is sometimes called “negative coordination,” and it cuts lung delivery roughly in half.
Why Breathing Speed Matters for MDIs
Counterintuitively, a slow, steady breath is not always better with an MDI. Lab testing on albuterol MDIs found that faster inhalation rates (around 60 liters per minute) delivered over 40% of the medication to the lungs, while the traditionally recommended slower rate of 30 liters per minute kept delivery below 40% across all conditions tested. The peak performance, about 44% lung deposition, came at a moderate-fast flow sustained over 4.5 seconds. In practical terms, breathe in with steady force, not a tiny sip of air, and keep inhaling for several seconds to pull the medication deep into your airways.
Dry Powder Inhalers (DPIs)
Dry powder inhalers include devices like the Diskus, Turbuhaler, and Ellipta. They don’t use a pressurized spray. Instead, your breath pulls the powdered medication into your lungs. This changes the technique in one major way: you need to inhale fast and hard, not slow and steady.
- Open the cover or slide the lever to expose the mouthpiece.
- Load the dose as your device instructions show. Do not tip or shake a DPI. Tilting it can spill the powder before you inhale.
- Breathe out fully away from the mouthpiece (exhaling into the device can blow the powder out).
- Seal your lips around the mouthpiece.
- Breathe in fast, deep, and forcefully. A quick, powerful inhale is what breaks up the powder and carries it into your lungs.
- Hold your breath for about 10 seconds.
- Exhale slowly away from the device.
The most common confusion between MDIs and DPIs is inhalation speed. An MDI works best with a moderately paced, sustained breath. A DPI requires a fast, forceful breath right from the start. Using the wrong breathing pattern for your device type significantly reduces how much medication you actually receive.
Soft Mist Inhalers
The Respimat is the most widely used soft mist inhaler. It produces a slow-moving mist without propellant, which makes coordination a bit easier than with an MDI. To use it, turn the clear base to the left until it clicks, open the cap, breathe out fully, then seal your lips around the mouthpiece and press the button while inhaling slowly and deeply. Hold your breath for 10 seconds.
The first time you use a Respimat, you need to prime it by doing the turn-open-press cycle three times (or until you see a visible mist). After that initial priming, you won’t need to prime it again.
Priming a New or Unused Inhaler
MDIs need to be primed before first use, after they’ve sat unused for several days, or if you drop the device. Priming clears the valve and ensures the first puff delivers a full dose. For most MDIs, priming means shaking the inhaler and spraying it into the air (pointed away from your face) up to four times. The exact number varies by brand, so check the insert that came with yours.
DPIs generally don’t need priming. The powder sits in a blister or reservoir and is loaded mechanically each time you prepare a dose.
Using a Spacer
A spacer is a tube or chamber that attaches to your MDI’s mouthpiece. It holds the medication cloud for a moment after you press the canister, giving you more time to inhale it. This solves the coordination problem that causes many people to mistime the press-and-breathe step. Spacers are especially helpful for children, older adults, and anyone who struggles with the timing of a standard MDI. The technique is the same as above, but with the spacer attached, you press the canister first and then inhale slowly from the spacer within a few seconds.
The Three Errors That Hurt You Most
A large study called CRITIKAL tracked which inhaler mistakes actually worsened asthma control and increased flare-ups. Three errors stood out as genuinely critical across multiple device types:
- Not exhaling before inhaling the dose. If your lungs are already partly full, the medication can’t travel as deep into your airways. Breathe out completely every time.
- Skipping the breath hold, or holding for less than 3 seconds. Ten seconds gives the medication time to settle onto airway surfaces. Anything under 3 seconds was linked to worse outcomes.
- Not opening the device properly. This sounds obvious, but forgetting to remove the cap, slide the cover, or fully prepare the device before inhaling was common enough to measurably affect results.
These aren’t minor technique tweaks. Each one was independently associated with uncontrolled asthma and higher rates of serious flare-ups.
Cleaning Your Inhaler
Medication residue builds up inside the plastic actuator of an MDI over time, which can partially block the spray. Clean it at least once a week. For most rescue inhalers (like albuterol brands), remove the metal canister and mouthpiece cap, then run warm water through the top of the actuator for 30 seconds and through the mouthpiece for another 30 seconds. Let all the pieces air dry completely, typically overnight, before reassembling. Never put the metal canister in water.
Some inhaled steroid devices have different cleaning rules. Certain brands instruct you to leave the canister in place and instead use a damp cotton swab to clean the small opening where the spray comes out, then wipe the inside of the mouthpiece with a damp tissue. Always check your specific device’s instructions, since the wrong cleaning method can damage it.
DPIs should never be washed with water. Moisture clumps the powder and ruins doses. A dry cloth to wipe the mouthpiece is all they need.