How to Use an Inhaler Correctly: 7 Mistakes to Avoid

You grab the plastic canister, press down, take a quick breath, and carry on with your day.

If that sounds like your usual routine, there is a very high probability that most of the medicine you just dispensed never made it past the back of your tongue.

Pulmonary medicine has a quiet, pervasive secret: up to 80% of patients who use a metered-dose inhaler do not use it properly. When an inhaler fails to relieve chest tightness, wheezing, or persistent coughing, the immediate reaction is often to assume the medication isn’t working or that the underlying asthma or COPD has worsened.

More often than not, the drug is fine. The physics of delivery broke down somewhere between your hand and your lungs.

Why Getting Medication into the Lungs Is So Mechanically Difficult

Your respiratory tract is specifically built to keep foreign airborne particles out.

From the sharp bend at the back of the oropharynx to the branching maze of the bronchial tree, your airway acts as a mechanical filter. When an inhaler releases a plume of aerosolized drug, those droplets travel fast. If your timing is off by a fraction of a second, inertial impaction takes over: the high-speed droplets slam directly into the back of your throat, where they are swallowed into the stomach rather than drawn down into the microscopic alveoli.

Swallowed bronchodilators or corticosteroids don’t open airway smooth muscle. Instead, they get processed systemically by the liver, giving you jittery hands, a racing pulse, or a hoarse throat while leaving your bronchial tubes just as inflamed and constricted as they were before.

7 Critical Inhaler Mistakes You Need to Stop Making

1. Inhaling Too Fast and Sharp

This is the single most common error with pressurized metered-dose inhalers (pMDIs). People treat the canister like a breath freshener—spraying and inhaling with a violent, rapid gasp.

A sharp, fast intake causes turbulence. The aerosolized droplets collide violently with your mouth and vocal cords.

With a standard pMDI, the breath must be slow, smooth, and deep—lasting roughly three to five seconds. Think of sipping a thick drink through a straw, not gasping after surfacing from underwater.

(Note the exception: Dry Powder Inhalers, or DPIs, work in reverse. Because DPIs are breath-actuated and have no chemical propellant, they require a forceful, deep intake right from the start to mechanically break the dry lactose-drug blend apart.)

2. Neglecting to Exhale Fully Before the Dose

You cannot fill a cup that is already full.

If you try to inhale your dose while your lungs are still half-full of air, your diaphragm barely travels downward. You run out of lung capacity before the aerosol plume has time to travel deep into the lower lobes.

Before lifting the mouthpiece to your lips, turn your head away and blow out smoothly until you reach functional residual capacity—emptying your lungs comfortably. Only then do you form a tight seal and begin your slow, coordinated intake.

3. Fumbling the Press-and-Breathe Coordination

Spraying the canister too early means you breathe in leftover air after the plume has settled. Spraying too late means the medication slams into a closed glottis.

The actuation must happen slightly after you begin your slow inhalation. Start breathing in through your mouth, and a split second later, press the canister down while continuing the smooth, uninterrupted breath.

If matching that micro-second timing feels impossible—especially during an acute asthma flare when breathing is panicked—a valved holding chamber (spacer) removes the coordination problem entirely.

4. Skipping the 10-Second Breath-Hold

Inhaling the drug is only half the battle; keeping it there is what allows sedimentation to occur.

If you inhale the dose and immediately exhale a visible puff of vapor, you just blew the medicine right back out into the room.

Once your lungs are full, remove the inhaler from your mouth, close your lips, and hold your breath for a solid 10 seconds—or for as long as is comfortable. This pause lets the tiny drug particles settle directly onto the mucosal surface of the bronchioles through gravity rather than being caught in the outward rush of exhalation.

5. Firing Consecutive Puffs in Immediate Succession

If your prescription calls for “two puffs as needed,” that does not mean pressing the canister twice in one continuous breath.

When an aerosol canister discharges, the rapid decompression of the propellant causes the internal metering chamber to drop dramatically in temperature (the Joule-Thomson effect). If you immediately fire a second puff, the internal pressure has not normalized, and the subsequent spray delivers an inconsistent, sub-therapeutic dose.

Wait roughly 30 to 60 seconds between actuations. Shake the canister again, reset your posture, breathe out fully, and take the second puff as an entirely separate procedure.

6. Refusing to Use a Spacer

There is an unfortunate, lingering stigma that spacers are only for young children.

In clinical reality, almost every adult using a pressurized metered-dose inhaler would benefit from one.

A spacer slows down the high-velocity plume, traps the large non-respirable droplets that would otherwise stick to your tongue, and suspends the micro-fine medicine particles in a chamber for several seconds. Studies consistently show that adding a spacer increases pulmonary drug deposition by up to double while significantly reducing systemic side effects.

7. Failing to Rinse and Spit After Inhaled Corticosteroids

Controller inhalers frequently contain potent corticosteroids (such as fluticasone or budesonide) to suppress long-term airway inflammation.

When steroid particles sit on the mucosal lining of your mouth and pharynx, they suppress local immune defenses. This creates an ideal breeding ground for Candida albicans, resulting in oral thrush (painful white patches on the tongue and inner cheeks) or chronic dysphonia (a raspy, weakened voice).

Every single time you use a steroid-containing maintenance inhaler, swish water vigorously around your mouth, gargle at the back of your throat, and spit it out into the sink. Never swallow the rinse water.

Quick Guide: MDI vs. DPI Technique

Feature	Pressurized Metered-Dose Inhaler (pMDI)	Dry Powder Inhaler (DPI)
Common Examples	ProAir HFA, Ventolin HFA, Flovent HFA	Diskus, Turbuhaler, Ellipta, Flexhaler
Delivery Mechanism	Chemical propellant pushes aerosol out	Patient’s own inhalation pulls dry powder
Inhalation Speed	Slow and steady (3 to 5 seconds)	Quick and forceful (deep pull from start)
Spacer Compatible?	Yes, highly recommended	No, moisture inside ruins the powder
Shaking Needed?	Yes, shake vigorously for 5 seconds	No, simply click/load the dose upright

When to Bring Your Device to Your Provider

Next time you visit your primary care physician, pulmonologist, or respiratory therapist, do not just tell them your breathing status—bring your actual inhalers into the exam room.

Physically demonstrate how you take a dose in front of them.

Small mechanical habits creep in over time without us realizing it. Verifying your physical technique ensures that every dollar spent at the pharmacy counter actually translates into clear, open airways and reliable relief when you need it most.