Nebuliser or inhaler — which does your family need?

A nebuliser hums, produces visible mist, takes ten minutes and looks like treatment. An inhaler is a small plastic object that makes a brief hiss. It is entirely understandable that families trust the machine more, and that many buy one to keep at home.

For most situations that instinct is wrong, and occasionally it is dangerous.

What each one actually does

Both deliver the same drug — usually salbutamol, the reliever that opens narrowed airways. They differ only in how they turn it into something you can breathe in.

A metered-dose inhaler releases a measured puff of medicine as a fine spray. Used with a spacer — the plastic chamber the inhaler fits into — the spray slows down, the propellant evaporates, and you breathe the drug in over several normal breaths. The spacer removes the need to coordinate pressing and inhaling, which is the difficult part.

A nebuliser uses a compressor to turn liquid medicine into a continuous mist, breathed through a mask or mouthpiece over five to fifteen minutes.

What the evidence says

This question has been studied properly, repeatedly, including in children in emergency departments. The consistent finding is that a reliever inhaler used with a spacer is at least as effective as a nebuliser for mild and moderate attacks — and in children it tends to perform slightly better, with shorter stays and fewer side effects.

Side effects matter here. Nebulised salbutamol more often causes a fast heartbeat, shakiness and agitation, simply because the delivered dose tends to be larger.

Typical equivalence for an attack: four to ten puffs of a reliever through a spacer, one puff at a time with several breaths after each, repeated as advised — rather than one nebuliser session. Your own plan should specify the number for you or your child.

Why the inhaler and spacer usually wins

It is faster. Ten puffs through a spacer takes about two minutes. A nebuliser takes ten to fifteen. In a deteriorating attack, that difference is not trivial.

It is portable. It works in a car, at school, at a wedding. A nebuliser needs a power socket, which is exactly where people are not when symptoms start.

It needs no maintenance. Nebuliser tubing, chambers and masks need cleaning and periodic replacement. A poorly maintained nebuliser can deliver less drug than intended, and in rare cases becomes a source of infection.

The dose is predictable. Nebuliser output varies with the device, the fill volume and the flow rate. A puff is a puff.

It is cheaper. A spacer costs a fraction of a compressor.

When a nebuliser does make sense

It is not useless, and there are genuine situations for it:

• A severe attack, where someone cannot generate enough breath to use a spacer well, and especially where oxygen is being given at the same time.
• Infants and very young children who will not tolerate a mask spacer, though a spacer with a soft mask is usually workable with practice.
• Someone unable to use a spacer — significant frailty, severe arthritis, a cognitive difficulty.
• Certain drugs that only come in nebulised form, such as some antibiotics and mucus-thinning treatments used in bronchiectasis and cystic fibrosis.
• Some people with advanced COPD, where a trial has shown clear benefit over inhalers.

Those are real indications and they are decided individually, not by default.

The risk nobody mentions

Here is the part that matters most, and it is the reason this article exists.

A nebuliser at home can delay a child reaching help.

The pattern is familiar: a child's breathing worsens in the evening, the machine comes out, there is improvement for twenty minutes, so another session is given. Then another. By the time the family travels to hospital, several hours have passed and the child is considerably worse.

A nebuliser produces temporary relief in a deteriorating attack. It does not treat the underlying inflammation, and repeating it is not a plan — it is a way of watching a child deteriorate while appearing to act. Needing a reliever again within three to four hours means the attack is not controlled, and that is a reason to be seen, not to repeat the dose.

Take a child to hospital the same hour if they are struggling to breathe, sucking in at the ribs or neck, too breathless to speak or feed, blue or grey around the lips, or if the reliever is needed more often than every three to four hours. A chest that has gone quiet in a child who was wheezing loudly is worse, not better.

What a spacer costs, and the bottle that works

Cost is often the unspoken reason a family ends up with the wrong device, so it is worth being direct. A commercial spacer costs a small fraction of a nebuliser compressor, lasts about a year, and needs no electricity or servicing. If the choice is between buying a machine and buying a spacer, buy the spacer.

If even that is not available at the moment, there is a genuine alternative that has been studied rather than merely improvised: a 500ml plastic bottle, with a hole cut so the inhaler mouthpiece fits snugly into the base, breathed from the bottle's mouth. Trials in several countries have found it performs comparably to a manufactured spacer for treating attacks in children. It is better than an inhaler used alone, and far better than nothing while you wait.

Two cautions. The seal matters — a loose hole leaks most of the dose. And a clear bottle lets you see whether the mist is being inhaled, which is useful with a reluctant child. Treat it as a stopgap and buy a proper spacer when you can; the valve and mask on a commercial one make a real difference for small children.

Things that should not go in a nebuliser

A nebuliser is a delivery device, not a treatment in itself, and a surprising range of things get put into one.

Antibiotics not formulated for inhalation. Crushing or decanting an injectable or oral antibiotic into a nebuliser is dangerous. The few antibiotics given this way are specific preparations used for specific conditions under supervision.

Plain saline for a cold. Harmless, but it does nothing a steam inhalation or saline nasal drops would not do, and it teaches a family to reach for the machine.

Someone else's steroid respules. Nebulised budesonide is a real treatment with real indications, and it is frequently used on a neighbour's advice for an ordinary cough. It will not help a viral illness, and it delays the assessment of a child whose breathing is worsening.

Oils, rubs, camphor, syrups, home-made mixtures. Nothing oily should ever be inhaled; it can cause a form of pneumonia that is difficult to treat.

Anything at all, repeatedly, without review. If a nebuliser is being used more than occasionally, the treatment plan is wrong, not the dose.

The thing that decides whether either works

Neither device helps if the technique is wrong, and technique is where most treatment fails.

For an inhaler with a spacer: shake it, fit it into the spacer, seal lips around the mouthpiece (or the mask firmly over the nose and mouth of a small child), press once, then take five or six normal breaths. Then press again for the next puff. Never fire several puffs into the chamber at once — they stick to the walls and to each other.

For a nebuliser: sit upright, use a mouthpiece rather than a mask if old enough, breathe normally, and run it until the misting stops and sputters.

Clean a spacer weekly in warm soapy water and let it air dry — do not rub it dry, because that builds static that attracts the drug to the walls.

And the question underneath

If a family is reaching for either device often, the real issue is usually not which one to use. Needing a reliever more than twice a week means the preventer treatment needs reviewing. That is a conversation worth having before the next bad night, not during it.

A child coughing at night covers how childhood asthma is recognised and what we test. To review a plan — bring the inhalers, the spacer and the nebuliser if you have one — book a consultation or call 8563816000.