Asthma Inhalers: Why the Blue One Does Not Treat Asthma, and the Technique That Doubles the Dose

Two inhalers, and almost everybody prefers the wrong one.

The reliever works in minutes. You can feel it. The chest opens, the wheeze eases, and the relief is unmistakable. So it lives in the pocket and gets used whenever breathing gets tight.

The preventer does nothing you can feel. Take it and nothing happens. It sits in a drawer and gets forgotten within a fortnight.

🔵 The two jobs

The practical consequence is counter-intuitive: if you are using the reliever often, the answer is more preventer, not more reliever. Reaching for the blue inhaler more frequently treats the same symptom repeatedly while the cause goes untouched.

📊 How often is too often

There is a number for this, and it is lower than most people assume.

Four questions settle whether asthma is controlled, and they are the ones a clinician asks. In the past month, have you:

• ☀️ Had daytime symptoms more than twice a week
• 🌙 Been woken at night by asthma, even once
• 💨 Needed the reliever more than twice a week
• 🏃 Had to limit any activity because of breathing

No to all four is controlled asthma. One or two yeses means partly controlled. Three or four means uncontrolled, and the plan needs changing rather than enduring.

💨 The technique, which decides whether any of it works

This section matters more than drug choice, because an inhaler used badly delivers most of the dose to the back of the throat and almost none to the lungs. Studies consistently find the majority of patients make at least one significant error, and nobody checks.

For a standard pressurised inhaler — the pocket puffer:

• 🌀 Shake it for five seconds
• 💨 Breathe all the way out, away from the inhaler. This is the most commonly skipped step and one of the most important — you cannot draw the dose in on a full chest
• 👄 Seal your lips around the mouthpiece
• 🟦 Press once and breathe in slowly and deeply over four to five seconds — slow, like sipping through a straw, not a sharp sniff
• ⏱️ Hold your breath for ten seconds, or as long as is comfortable
• 🔄 Wait thirty seconds before the second puff, and shake again

The five errors that waste the dose: not breathing out first; breathing in too fast; firing two puffs in one breath; not holding the breath afterwards; and pressing before the breath has started or after it has finished.

And the trap that catches people who switch devices: dry powder inhalers — the disc and twist types — need the opposite technique. With those you breathe in fast and hard, not slow and deep. Someone trained on a puffer who is handed a powder device and keeps inhaling gently gets very little of it. Always ask to be shown the technique for the specific device you have been given.

One more step that is almost always omitted: rinse your mouth and spit after every steroid inhaler dose. It prevents oral thrush and hoarseness, which are the two complaints that make people stop taking the preventer.

📈 The ladder, and the one rule that must not be broken

Treatment steps up and down according to control.

Stepping down matters too. Once control has been stable for around three months, the dose can often be reduced — but it is reduced deliberately with review, not by quietly stopping, which is how people end up back at the beginning.

💨 An attack: what to do, in order

Everyone with asthma should have this written down, and most do not.

1. Sit upright. Do not lie down
2. Take the reliever: one puff at a time, through a spacer if you have one, up to ten puffs, with about thirty to sixty seconds between each
3. Wait ten minutes. If breathing is easing, continue to monitor and arrange to be seen
4. If there is no improvement after ten puffs, or you are getting worse at any point — call emergency services
5. While waiting, keep taking the reliever, one puff a minute, up to ten more puffs

Two practical notes. Never withhold the reliever during an attack for fear of overusing it — the limits above exist for routine use, not emergencies. And an attack that needed emergency treatment or oral steroids is a reason for the preventive plan to be reviewed within a few days, not just for the episode to be survived.

🌳 Triggers, and the ones worth acting on

Avoiding every trigger is not achievable. A few are worth real effort because the return is large.

• 🚬 Smoking, and smoke in the house. Beyond the direct irritation, smoking substantially reduces how well inhaled steroids work — so it undermines the treatment as well as worsening the disease. The highest-value change available, and the methods are in our guide to smoking cessation
• 🤧 Hay fever and a blocked nose. Treating the nose measurably improves the chest, and this connection is routinely missed — the airway is continuous
• 💤 House dust mite, where testing shows it matters: mattress and pillow covers, hot washing, reduced soft furnishings in the bedroom
• 🐾 Pets, where relevant — at least keeping them out of the bedroom
• 🌡️ Cold air and exercise — use the reliever ten to fifteen minutes beforehand and warm up gradually. Exercise is good for asthma and should not be avoided
• 🤒 Colds and flu, the commonest trigger of all. Annual influenza vaccination is worth having

Three things that worsen asthma and are rarely connected to it:

• 💊 Aspirin and anti-inflammatories in a minority of people with asthma, sometimes severely. If one has ever made your breathing worse, avoid the whole class and say so
• 🩸 Beta blockers, including eye drops for glaucoma, which can provoke bronchospasm
• 🔥 Acid reflux, which can drive a persistent cough and worsen control

Weight matters too — excess weight worsens asthma control and reduces response to treatment.

📏 Peak flow, used properly

A peak flow meter measures how fast you can blow out, and its value lies in comparison rather than in the absolute number.

Establish your personal best over two weeks of good control, then use that as the reference. Readings are taken standing, before the reliever, morning and evening.

• 🟩 Above 80 percent of your best — good control
• 🟧 50 to 80 percent — worsening. Follow your action plan and seek advice
• 🟥 Below 50 percent — severe. Emergency treatment

One pattern worth knowing: a large gap between the morning and evening reading, or readings that dip sharply before dawn, indicates poorly controlled asthma even when the daytime number looks acceptable.

💊 Side effects, and the ones that are avoidable

The steroid inhaler. At the doses used in asthma it acts locally in the airway with limited systemic absorption, which is the whole point of inhaling it rather than swallowing it. The two common complaints are oral thrush and hoarseness, and both are largely prevented by the two measures above — a spacer and rinsing the mouth afterwards. At higher doses and over years, bone density and other systemic effects become a consideration, which is why the dose is stepped down when control allows.

The reliever. Tremor, palpitations and a jittery feeling are dose-related and harmless, though unpleasant. Heavy use can lower potassium.

Montelukast. Generally well tolerated, with one caution worth stating because it is not widely known: it carries a warning about neuropsychiatric effects — sleep disturbance, vivid dreams, agitation, low mood and behavioural change, particularly in children. These are reversible on stopping and should be reported rather than attributed to something else.

Theophylline. A narrow therapeutic range, so blood level monitoring is used, and a long list of interactions — including with several antibiotics and with stopping smoking, which raises its level. It belongs under supervision rather than as a self-managed addition.

🔎 When it is not asthma

Breathlessness and cough have several other explanations, and two are commonly confused with it.

• 🫁 COPD — in a smoker or ex-smoker over 40, with breathlessness that is steadily progressive rather than variable, and less response to a reliever. Asthma varies from day to day; COPD does not vary much. Chronic productive cough is covered in our guide to chronic bronchitis
• 🦠 A chest infection — fever, feeling systemically ill, one-sided chest pain. See our guide to pneumonia and when hospital is needed
• 🗣️ Upper airway causes — noisy breathing on the in-breath, throat tightness, a sensation at the voice box rather than in the chest, and a reliever that does nothing
• ❤️ Heart failure — breathlessness lying flat, waking at night, ankle swelling
• 😰 Breathing pattern disorder — frequently alongside genuine asthma rather than instead of it, and it responds to breathing retraining rather than to more medication

Where the diagnosis is uncertain, spirometry with reversibility testing is the standard, and a normal result when you are well does not exclude asthma because it varies by definition.

📞 When to seek help

This week:

• Using the reliever more than two or three times a week
• More than one reliever canister a month
• Waking at night with asthma, even occasionally
• Any attack that needed emergency treatment or oral steroids — the plan needs reviewing, not just the episode surviving
• Peak flow consistently between 50 and 80 percent of your best
• Given a long-acting bronchodilator without a steroid — query it

Worth an appointment:

• Never having had your inhaler technique checked — ask to demonstrate it and be corrected. This is the highest-value ten minutes available
• No spacer, particularly if you use a steroid inhaler
• No written action plan
• Thrush or hoarseness on the preventer — fixable with a spacer and rinsing, rather than a reason to stop
• Hay fever or a persistently blocked nose alongside asthma
• Breathing worse after aspirin or an anti-inflammatory
• Taking a beta blocker, including eye drops
• Sleep disturbance, vivid dreams or mood change on montelukast, especially in a child
• Stopping smoking while on theophylline, which raises its level
• Pregnancy — asthma treatment is continued in pregnancy, and uncontrolled asthma is the greater risk

❓ Frequently asked questions

📑 Sources and editorial

• Global and national asthma management guidelines, including the role of inhaled corticosteroids as controller therapy, assessment of control, and the stepwise approach to treatment
• National asthma death review findings on reliever over-reliance and under-use of preventive inhaled corticosteroid therapy
• Guidance on reliever use frequency and canister consumption as markers of poor control and of risk of severe exacerbation
• Studies of inhaler technique error rates in patients and of the effect of technique on lung drug delivery
• Evidence on valved holding chambers and spacers, including the effect on pulmonary deposition and on oropharyngeal deposition, and guidance on cleaning and static
• Comparative guidance on inhalation manoeuvre for pressurised metered-dose inhalers versus dry powder inhalers
• Regulatory and trial evidence on long-acting beta agonist monotherapy in asthma and associated risk of severe exacerbation and death, and on fixed-dose combination inhalers
• Prescribing information for inhaled fluticasone, budesonide and ciclesonide, including local adverse effects and measures to reduce them
• Prescribing information for albuterol, including dose-related tremor, palpitations and effects on potassium
• Regulatory warnings on montelukast and neuropsychiatric adverse events
• Prescribing information and monitoring guidance for theophylline, including therapeutic range and interactions, and the effect of smoking cessation on serum levels
• Guidance on recognition and emergency management of acute asthma, including the silent chest, peak flow thresholds and reliever dosing during an attack
• Evidence on the effect of cigarette smoking on inhaled corticosteroid responsiveness in asthma
• Literature on aspirin-exacerbated respiratory disease, beta blocker use in asthma, gastro-oesophageal reflux, allergic rhinitis and obesity as modifiers of asthma control
• Guidance on peak expiratory flow monitoring, personal best values and diurnal variation
• Related reading: chronic bronchitis, pneumonia and when hospital is needed, respiratory tract infections, smoking cessation aids
• Related products: Flovent (Fluticasone), Proventil (Albuterol), Singulair (Montelukast), Theo-24 (Theophylline), asthma category
• RXshop Editorial Team — reviewed by Emily Chen, MD, MPH — Internal Medicine Specialist