What Is a Ventolin Inhaler Used For? The Blue Inhaler Explained
What Ventolin (salbutamol) is used for, how it works, how many puffs to take, side effects, how to use it, and when needing it often means your asthma needs a review.
Part of our asthma guide: symptoms, triggers and treatment.
Asthma attack? Get help now. Call 999 if your reliever isn’t helping, you’re too breathless to speak, eat or sleep, your breathing is getting faster, or your lips or fingertips are turning blue or grey. While you wait, sit up straight and take 1 puff of your blue reliever every 30 to 60 seconds, up to 10 puffs, through a spacer if you have one. If the ambulance hasn’t arrived after 10 minutes, repeat. Don’t complete an online consultation in an emergency.
Quick answer: Ventolin (salbutamol) is the blue reliever inhaler. It’s used to relieve asthma symptoms such as wheezing, breathlessness, chest tightness and cough, to prevent symptoms brought on by exercise, and to relieve breathlessness in COPD. It works within a few minutes and lasts 4 to 6 hours. It doesn’t treat the inflammation behind asthma, so most adults also need a preventer or a combination inhaler. Needing it more than twice a week is a sign your asthma needs a review.
Already prescribed Ventolin? See our Ventolin Evohaler or all our asthma inhalers online.
Order Your Usual Reliever Inhaler
Access Doctor is a GPhC-registered pharmacy (#9011198). If you’re an adult with diagnosed asthma or COPD, a pharmacist independent prescriber reviews your online consultation and supplies your usual inhaler if it’s safe, and we let your GP know. Approved before 3pm, Monday to Friday? Dispatched the same day, by Royal Mail Tracked 48, Tracked 24 or Special Delivery guaranteed by 1pm next working day: you choose. Delivery is free on orders over £40.
Start Asthma Consultation →Who our online service is for. Access Doctor supplies asthma and COPD inhalers to adults aged 18 and over who already have a diagnosis, for the same inhaler, strength and dose they’re prescribed now, and we share the consultation with your GP. We can’t diagnose asthma or start or change treatment online. Children’s inhalers are managed by their GP or asthma nurse.
What Is Ventolin?
Ventolin is a brand name for salbutamol, one of the most widely used medicines in the UK. It’s the blue inhaler most people associate with asthma. Ventolin Evohaler, made by GSK, is a pressurised metered-dose inhaler (an aerosol inhaler) that gives 100 micrograms of salbutamol per puff. Salbutamol has been used to treat asthma since the late 1960s.
Salbutamol belongs to a group of medicines called short-acting beta-2 agonists (SABAs). It relaxes the muscles around the airways so they widen and air can move more easily, which is called bronchodilation. It starts working within a few minutes.
Other salbutamol inhalers in the UK include Salamol and Airomir. All contain the same medicine; they differ in the device. Ventolin is available on NHS prescription and, for adults who already use it, through regulated online pharmacies.
Ventolin is a reliever, not a preventer. It relieves symptoms quickly but doesn’t reduce airway inflammation. If you’ve been prescribed a preventer inhaler, keep using it every day alongside your Ventolin, even when you feel well.
Licensed Uses of Ventolin
Ventolin Evohaler is licensed in the UK for adults and children for:
Relief of asthma symptoms
When you have wheezing, breathlessness, chest tightness or cough caused by asthma.
Exercise and other triggers
Taken 10 to 15 minutes before exercise, or before an unavoidable trigger such as an allergen, to prevent symptoms.
COPD
Relief of breathlessness in reversible airways obstruction, including chronic obstructive pulmonary disease.
Asthma attacks
Repeated puffs through a spacer are the first step in an asthma attack while you wait for help. In hospital, salbutamol is also given through a nebuliser.
How Does Ventolin Work?
Salbutamol is a selective beta-2 agonist. It attaches to beta-2 receptors on the smooth muscle wrapped around your airways and makes that muscle relax. The airways widen, resistance to airflow falls and breathing gets easier. You can think of it as loosening a squeeze around a straw.
| Property | Detail |
|---|---|
| Starts working | Within 5 minutes |
| Peak effect | Usually within 30 to 60 minutes |
| Lasts | 4 to 6 hours |
| Forms | Inhaler (aerosol, dry powder or breath-actuated); also a nebuliser solution and tablets, mainly used in hospital or specific situations |
| Selectivity | Acts mainly on the airways; at normal inhaled doses the effect on the heart is small |
Ventolin for Asthma
In asthma, Ventolin is used when you have symptoms. It’s the fastest-acting treatment for asthma symptoms and the first thing to use in an attack. It:
- Quickly reverses airway narrowing, relaxing tightened airway muscle within a few minutes
- Relieves wheeze and breathlessness by widening the airways
- Eases chest tightness as the airways open
- Calms the cough that comes from narrowed airways
For more on breathlessness, including the causes Ventolin won’t help, see our guide to Ventolin for shortness of breath.
Ventolin does not reduce airway inflammation, the underlying cause of asthma. That’s why UK guidance (NICE, BTS and SIGN, 2024) says adults with asthma should use an inhaled steroid: either a daily preventer inhaler, or a combination inhaler such as Symbicort used as needed (AIR) or every day and as needed (MART). Our asthma inhalers guide explains each type.
Ventolin for COPD
COPD (chronic obstructive pulmonary disease) is a different condition from asthma, but it also narrows the airways, and bronchodilators partly reverse that. Salbutamol is widely used in COPD to relieve breathlessness when it happens.
In COPD, Ventolin is usually part of a wider plan that includes long-acting bronchodilators (LAMA and/or LABA) taken every day, which keep the airways open for 12 to 24 hours and reduce how often you need your reliever. If you’re using Ventolin often for COPD, ask your GP whether your regular treatment needs changing.
Asthma and COPD are different conditions with different long-term treatment. If you have COPD, don’t rely on Ventolin alone: make sure you have an up-to-date COPD plan from your GP or respiratory team.
Ventolin for Exercise-Induced Symptoms
Exercise-induced bronchoconstriction (narrowing of the airways during or after exercise) is common in people with asthma and also happens in some people without it, particularly athletes. Breathing in large amounts of cold, dry air cools and dries the airways and triggers the muscle around them to tighten.
- Prevention: 2 puffs taken 10 to 15 minutes before exercise, if your GP or asthma nurse has advised it.
- Treatment: 1 or 2 puffs during or after exercise if symptoms come on anyway.
If you need Ventolin before every exercise session, your asthma probably isn’t controlled well enough; with the right preventer or combination inhaler, many people can exercise without it. See our guide to exercise-induced asthma.
How Many Puffs of Ventolin Can I Take?
Each puff of Ventolin Evohaler gives 100 micrograms of salbutamol. Usual adult doses:
| When | Dose | Notes |
|---|---|---|
| Symptoms (wheeze, breathlessness, tight chest) | 1 or 2 puffs as needed | No more than 8 puffs in 24 hours. Wait about 30 to 60 seconds between puffs |
| Before exercise or a known trigger | 2 puffs, 10 to 15 minutes before | Only if your GP or asthma nurse has advised it |
| Asthma attack, while waiting for help | 1 puff every 30 to 60 seconds, up to 10 puffs | Through a spacer if you have one. Call 999 if you feel worse at any time or aren’t better after 10 puffs |
| Children | Set by their GP or asthma nurse | Children usually use a spacer, with a face mask if they’re young |
If your usual 1 or 2 puffs don’t help, or your symptoms are severe, treat it as an asthma attack and follow the steps in Asthma attack: what to do. Don’t keep taking extra puffs over hours instead of getting help.
How to Use Ventolin Correctly
Good technique makes a big difference to how much salbutamol reaches your lungs. Using a spacer, such as the AeroChamber Plus, is the easiest way to get it right, because you don’t need to time the press with your breath. See our step-by-step guide to how to use an asthma inhaler.
1
Remove the cap and shake well
If the inhaler is new, or you haven’t used it for a few days, test-spray it into the air as the leaflet describes.
2
Breathe out gently, away from the inhaler
Don’t breathe out into the mouthpiece. Hold the inhaler upright, with your index finger on top and thumb underneath.
3
Start breathing in slowly, then press once
Close your lips around the mouthpiece, start to breathe in slowly and steadily, and press the canister firmly once as you do. Keep breathing in for 3 to 5 seconds.
4
Hold your breath for up to 10 seconds
Take the inhaler out of your mouth and hold your breath for up to 10 seconds, or as long as is comfortable, then breathe out slowly.
5
Wait 30 to 60 seconds before a second puff
Shake again and repeat. Put the cap back on afterwards, and clean the plastic mouthpiece at least once a week, as the leaflet describes.
What’s in a Ventolin Evohaler, and How Many Puffs?
| Component | Detail |
|---|---|
| Active ingredient | Salbutamol (as salbutamol sulfate), 100 micrograms per puff |
| Propellant | Norflurane (HFA-134a), which is CFC-free; there are no other ingredients |
| Puffs per inhaler | 200 |
| Dose counter | None: keep a note of how many puffs you’ve used |
| Storage | Below 30°C, away from frost and direct sunlight. Don’t puncture or burn the canister, even when empty |
Because the Ventolin Evohaler has no dose counter, the product information suggests keeping a record of the puffs you use. Replace it before you reach 200, even if it still seems to spray, because the last puffs may not contain a full dose. Shaking it, feeling the weight or floating it in water aren’t reliable checks.
How to Dispose of Your Ventolin Inhaler
- Return used and out-of-date inhalers to a pharmacy so they can be disposed of safely. Don’t put them in household rubbish or recycling.
- Don’t puncture or burn the canister, even when it’s empty: it’s still under pressure.
- Use each inhaler until it’s finished (200 puffs) before starting a new one, unless it’s out of date.
The propellant in aerosol inhalers is a greenhouse gas, so inhalers have a carbon footprint. It varies between devices: Salamol uses less propellant than Ventolin and has a lower footprint, and dry powder inhalers lower still. If that matters to you, ask about it at your asthma review, but don’t switch inhalers on your own: the device has to suit you, and good asthma control comes first.
Side Effects of Ventolin
Ventolin is generally well tolerated at normal doses. Side effects are usually mild and pass within minutes.
- Common: shaking (tremor), usually in the hands; headache; a faster heartbeat
- Uncommon: palpitations (a pounding or irregular heartbeat); mouth and throat irritation; muscle cramps
- Rare: low potassium in the blood, mainly at high doses; feeling warm or flushed
- Very rare: feeling restless or overactive; wheezing that gets suddenly worse straight after a puff (paradoxical bronchospasm)
Stop using it and get urgent help if your wheeze or breathlessness gets suddenly worse straight after a puff, or you get swelling of the face, lips or throat or a sudden rash. Use a different reliever if you have one and call 999.
If tremor or palpitations bother you, a spacer often helps because less medicine is swallowed and absorbed. Speak to your GP or asthma nurse if side effects continue.
Cautions and Interactions
Tell your prescriber before using Ventolin if you have:
- A heart condition, an irregular heartbeat or high blood pressure
- An overactive thyroid (thyrotoxicosis)
- Diabetes: high doses of salbutamol can raise blood sugar
- Low potassium
Medicines to mention:
- Beta-blockers, such as propranolol, and some glaucoma eye drops: they can block salbutamol and may make asthma worse. Non-selective beta-blockers shouldn’t usually be used with salbutamol
- Water tablets (diuretics), steroid tablets and theophylline: with high doses of salbutamol they can lower potassium
- Digoxin: low potassium can increase its side effects, so tell your prescriber if you take it
Ventolin in Pregnancy and Breastfeeding
Keep using your reliever if you need it during pregnancy. Poorly controlled asthma carries real risks for you and your baby, including premature birth, low birth weight and low oxygen levels, which are greater than the risks from inhaled salbutamol. The product information says Ventolin should be used in pregnancy when it’s clearly needed, so your midwife and GP should know which inhalers you use.
Small amounts of salbutamol pass into breast milk, and the product information says use while breastfeeding needs careful consideration; inhaled salbutamol at normal doses is widely used by breastfeeding mothers. Don’t stop any asthma inhaler during pregnancy without advice. See our guide to asthma in pregnancy.
Ventolin vs Salamol
Ventolin Evohaler and Salamol both contain salbutamol 100 micrograms per puff and work in exactly the same way; the main differences are the maker (GSK and Teva) and the look and feel of the inhaler. Both work with a spacer. For a side-by-side table, see our Salamol vs Ventolin comparison. If you find the press-and-breathe timing difficult, a spacer may help; ask your GP or asthma nurse.
Reliever vs Preventer: The Key Distinction
| Ventolin (reliever) | Preventer inhaler (inhaled steroid) | |
|---|---|---|
| Colour | Usually blue | Often brown, orange or purple (check the label) |
| Medicine type | Short-acting beta-2 agonist (SABA) | Inhaled corticosteroid (ICS) |
| When used | When you have symptoms | Every day, even when well |
| Works in | Minutes | Days to weeks for the full effect |
| What it does | Opens the airways | Reduces inflammation |
| Treats the underlying problem? | No | Yes |
| Examples | Ventolin, Salamol, Bricanyl | Clenil Modulite, Pulmicort, Qvar |
Using Ventolin without a preventer treats symptoms but leaves the inflammation underneath, which increases the risk of severe attacks over time. Since 2024, UK guidance says adults with asthma shouldn’t be treated with a reliever alone. If that’s your current plan, book a review with your GP or asthma nurse.
How Often Can You Use Ventolin?
Day to day, use 1 or 2 puffs when you need them, and no more than 8 puffs in 24 hours. In an asthma attack, the NHS steps allow up to 10 puffs while you wait for help. Beyond the daily maximum, what matters most is how often you’re reaching for it:
- Using Ventolin more than twice a week (other than before exercise) is a sign your asthma isn’t controlled
- Needing 3 or more reliever inhalers a year is linked to a higher risk of severe asthma attacks (MHRA, 2025)
- Either one is a reason to have your preventer or combination treatment reviewed. Overusing salbutamol without enough inhaled steroid can hide worsening inflammation
Signs Your Asthma Is Not Controlled
Speak to your GP or asthma nurse if any of these apply. They’re signs your treatment needs reviewing:
- Using Ventolin more than twice a week for symptoms (not just before exercise)
- Waking at night with asthma symptoms
- Asthma limiting your daily activities
- Needing steroid tablets or a hospital visit for asthma in the last year
- Getting through 3 or more reliever inhalers in a year
Well-controlled asthma means: no daytime symptoms most days, no night waking, no limits on activity, a reliever needed no more than twice a week, and no attacks. If that isn’t you, your treatment should be reviewed.
Why Is My Ventolin Inhaler Not Working?
If Ventolin isn’t giving the relief you expect, work through these, starting with the most common:
- Technique: poor technique is one of the most common reasons an inhaler seems not to work. A spacer helps.
- An empty inhaler: there’s no dose counter, so count your puffs; it may spray after 200 puffs without giving a full dose.
- Uncontrolled asthma: needing it more than twice a week means you need a preventer or combination inhaler, not more reliever.
- A different cause: breathlessness from vocal cord problems, over-breathing (hyperventilation) or heart failure won’t respond to salbutamol. Our guide to Ventolin for shortness of breath covers other causes.
If Ventolin isn’t working during an attack, call 999. Don’t wait if you’re very breathless, can’t speak in full sentences, or your lips or fingertips are turning blue or grey.
Asthma Attack: What to Do
If you have an asthma action plan, follow it. Otherwise, the NHS advises:
1
Sit up straight and try to keep calm
Don’t lie down.
2
Take 1 puff of your blue reliever every 30 to 60 seconds, up to 10 puffs
Use a spacer if you have one. If you use a combination inhaler as your reliever (AIR or MART), follow your plan: usually 1 puff every 1 to 3 minutes, up to 6 puffs.
3
Call 999
If you feel worse at any point, you don’t feel better after the puffs, or you don’t have your inhaler.
4
If the ambulance hasn’t arrived after 10 minutes, repeat step 2
Keep going until help arrives.
5
Afterwards, get an urgent GP appointment
Even if you feel better, see your GP or asthma nurse within 2 days of an attack, as the NHS advises.
Our asthma attack guide explains the warning signs in more detail.
Getting Ventolin Online
Can you buy Ventolin over the counter? No. Ventolin is a prescription-only medicine in the UK, so no pharmacy can sell it without a prescriber checking it’s right for you, either in person or online. Access Doctor is a GPhC-registered pharmacy (registration number 9011198). If you’re an adult with diagnosed asthma or COPD and already use Ventolin, you can order the same inhaler after an online consultation. A pharmacist independent prescriber checks it’s safe, and we share the consultation with your GP. Approved before 3pm, Monday to Friday? Dispatched the same day, by Royal Mail Tracked 48, Tracked 24 or Special Delivery guaranteed by 1pm next working day: you choose. Delivery is free on orders over £40.
See our guide to ordering an asthma inhaler online for how the service works, or go straight to all our asthma inhalers online.
Reliever · Rx
Ventolin Evohaler 100mcg
Salbutamol aerosol, the blue inhaler. 200 puffs. From £8.99.
View product →Reliever · Rx
Salamol 100mcg
The same medicine, salbutamol, in a different inhaler. From £13.99.
View product →Device
AeroChamber Plus adult spacer
Helps more of each puff reach your lungs. £9.99.
View product →Combination · Rx
Symbicort Turbohaler
Steroid and fast-acting reliever in one; used daily, or as AIR or MART. From £41.99.
View product →Safety, your GP and free NHS options
Ventolin and other asthma inhalers are prescription-only medicines in the UK. Before anything is supplied, a GPhC-registered pharmacist independent prescriber reviews your consultation, including the other medicines you take; some, such as beta-blockers, can make asthma worse.
- Relievers on their own: since 2024, UK guidance (NICE, BTS and SIGN) says no one with asthma should be treated with a reliever alone, and in April 2025 the MHRA told prescribers not to prescribe one without an inhaled steroid to people of any age with asthma. If you don’t use a preventer, we can supply a reliever once and will ask you to see your GP or asthma nurse.
- How many: up to 2 reliever inhalers per order. If you’ve needed 3 or more in the last 12 months, we’ll ask you to have an asthma review first; needing that many is linked to a higher risk of severe attacks.
- Read the leaflet in the pack, and ask a pharmacist or asthma nurse to check your technique.
- Report side effects to a pharmacist or doctor. You can also report them to the MHRA through the Yellow Card scheme.
We share your consultation with your GP because asthma needs ongoing care. Access Doctor is a private service, and there are free NHS options:
- Your GP practice: asthma reviews (at least once a year) and repeat prescriptions; many practices let you order repeats through the NHS App.
- Prescription charges: NHS prescriptions are free in Scotland, Wales and Northern Ireland. In England a charge applies unless you’re exempt, and a prepayment certificate can save money if you need several items.
- Urgent advice: NHS 111 (NHS 24 on 111 in Scotland), or 999 in an emergency.
Need Your Usual Inhaler?
Access Doctor is a GPhC-registered pharmacy (#9011198). If you’re an adult with diagnosed asthma or COPD, a pharmacist independent prescriber reviews your online consultation and supplies your usual inhaler if it’s safe, and we let your GP know. Approved before 3pm, Monday to Friday? Dispatched the same day, by Royal Mail Tracked 48, Tracked 24 or Special Delivery guaranteed by 1pm next working day: you choose. Delivery is free on orders over £40.
Start Asthma Consultation →Frequently Asked Questions
What is Ventolin used for?
Ventolin (salbutamol) is a reliever inhaler. It’s used to relieve asthma symptoms such as wheezing, breathlessness, chest tightness and cough, to prevent symptoms brought on by exercise when taken 10 to 15 minutes beforehand, and to relieve breathlessness in COPD. It starts working within a few minutes by relaxing the muscles around the airways. It’s a reliever, not a preventer, and doesn’t treat the inflammation behind asthma.
Is Ventolin a preventer or a reliever?
Ventolin is a reliever. It opens the airways within a few minutes but doesn’t reduce airway inflammation. Long-term asthma control needs an inhaled steroid, either in a preventer inhaler (often brown, orange or purple) or in a combination inhaler. UK guidance says adults with asthma shouldn’t rely on a blue reliever alone.
Can Ventolin be used for COPD?
Yes. Ventolin is licensed to relieve breathlessness in reversible airways obstruction, including COPD. In COPD it’s usually used alongside long-acting bronchodilators taken every day. If you’re using Ventolin often for COPD, ask your GP or respiratory team whether your regular treatment needs changing.
How often can you use a Ventolin inhaler?
Use it when you have symptoms: usually 1 or 2 puffs, and no more than 8 puffs in 24 hours unless your asthma action plan says otherwise in an attack. Needing it more than twice a week, apart from before exercise, means your asthma isn’t well controlled and you should book a review.
Does Ventolin reduce inflammation?
No. Ventolin is a bronchodilator: it relaxes the muscles around the airways. It doesn’t treat the inflammation underneath, which needs an inhaled steroid. Relying on a reliever alone lets that inflammation carry on and increases the risk of severe attacks.
How many puffs of Ventolin can I take?
The usual adult dose is 1 or 2 puffs when you need them, and no more than 8 puffs in 24 hours. In an asthma attack, NHS advice is different: take 1 puff every 30 to 60 seconds, up to 10 puffs, and call 999 if you feel worse at any time or you’re not better after 10 puffs.
What are the side effects of Ventolin?
The most common are shaking (usually in the hands), headache and a faster heartbeat. They usually wear off within minutes. Less often, people get palpitations, muscle cramps, mouth or throat irritation, or feel warm or flushed. Rarely, wheezing gets worse straight after a puff; if that happens, stop using it and get urgent help.
Is Ventolin the same as salbutamol?
Yes. Ventolin is a brand name and salbutamol is the medicine in it. Other salbutamol inhalers, such as Salamol and Airomir, contain the same medicine at the same dose. The differences are in the device and how it feels to use.
What is Ventolin Evohaler?
Ventolin Evohaler is the standard blue aerosol inhaler made by GSK. Each puff gives 100 micrograms of salbutamol, and each inhaler holds 200 puffs. You press the canister as you breathe in, ideally through a spacer.
How many puffs does a Ventolin Evohaler contain?
Each Ventolin Evohaler contains 200 puffs (metered doses). At 2 puffs a day that’s about 100 days, but if you’re getting through an inhaler much faster than that, your asthma may need a review.
How do I know when my Ventolin Evohaler is empty?
The Ventolin Evohaler doesn’t have a dose counter, so keep a note of how many puffs you use and replace it before you reach 200. Shaking it, feeling its weight or floating the canister in water aren’t reliable ways to check. Order a new one in good time so you’re never without a reliever.
Can I use Ventolin during pregnancy?
Keep using your reliever if you need it. Poorly controlled asthma is a bigger risk to you and your baby than salbutamol, and the product information says it should be used in pregnancy when it’s clearly needed. Don’t stop or change any asthma inhaler without advice, and tell your midwife and GP. See our guide to asthma in pregnancy.
Can I buy Ventolin online?
Ventolin is prescription-only, so it can’t be bought without a consultation. Access Doctor (GPhC reg. no. 9011198) can supply it online to adults with diagnosed asthma or COPD who already use it, after a pharmacist independent prescriber reviews their answers, and we let your GP know. See our guide to ordering an asthma inhaler online.
For symptoms, triggers and how asthma is diagnosed and treated, see our asthma guide.
References
- Electronic Medicines Compendium. Ventolin Evohaler 100 micrograms: Summary of Product Characteristics. medicines.org.uk
- NICE, BTS and SIGN. Asthma: diagnosis, monitoring and chronic asthma management (NG245), November 2024. nice.org.uk
- MHRA Drug Safety Update. Short-acting beta-2 agonists (SABA): reminder of the risks from overuse in asthma and changes in the SABA prescribing guidelines, April 2025. gov.uk
- NHS. Salbutamol inhaler. nhs.uk
- NHS. Asthma attack. nhs.uk
- Asthma + Lung UK. Asthma attacks. asthmaandlung.org.uk
- Joint Formulary Committee. Salbutamol. British National Formulary. bnf.nice.org.uk
- NHS. Chronic obstructive pulmonary disease (COPD). nhs.uk
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment. In a medical emergency, call 999.