Asthma Inhalers: Your Complete Guide to Reliever & Preventer Inhalers
Why Inhalers Work So Well
Unlike oral medications that must travel through the digestive system and bloodstream, inhalers deliver medication directly to the lungs — precisely where it is needed. This targeted delivery makes inhaled medicines significantly faster and more effective for respiratory conditions, while minimising systemic side effects because far less medication enters the bloodstream.
For people managing asthma or COPD, this precision has been genuinely transformative. A Ventolin (salbutamol) blue inhaler can restore easier breathing within 3–5 minutes — far faster than any oral alternative.
Reliever Inhalers: Fast-Acting Relief
Reliever inhalers — most commonly the blue salbutamol inhaler (Ventolin) or Salamol — are your emergency response to asthma symptoms. They contain a short-acting beta-agonist (SABA) that relaxes the smooth muscles surrounding the airways within minutes, widening them and restoring airflow.
Reliever inhalers are used on demand — only when you experience symptoms or before a known trigger such as exercise. They are not designed for daily preventive use.
Warning: If you are using your blue inhaler three or more times per week, your asthma is likely not well-controlled. Over-reliance on a reliever without a preventer is associated with significantly increased risk of a severe asthma attack. Speak to your GP or use Access Doctor’s online consultation.
Preventer Inhalers: Daily Airway Protection
Preventer inhalers contain inhaled corticosteroids (ICS) and work by reducing the chronic inflammation inside your airway lining — the underlying driver of asthma. Used every day, they gradually lower airway sensitivity to triggers, reducing the frequency and severity of symptoms and attacks. The protective effect takes 1–2 weeks to build.
Critical rule: continue using your preventer every day, even when you feel completely well. Stopping as soon as symptoms ease is one of the most common — and dangerous — mistakes in asthma management.
Combination Inhalers
Combination inhalers contain both an inhaled corticosteroid and a long-acting beta-agonist (LABA) in a single device, providing daily anti-inflammatory protection and sustained bronchodilation. Prescribed when a preventer alone is insufficient, they are used daily and must never be used as a substitute for a blue reliever during an acute attack. Examples include Seretide and Fostair.
Inhalers for COPD
Inhalers are equally central to managing chronic obstructive pulmonary disease (COPD). In the early stages, a reliever inhaler such as Ventolin may suffice during exacerbations. As COPD progresses, daily preventer therapy and long-acting bronchodilators typically become essential. See your doctor if you are finding your COPD symptoms increasingly difficult to manage.
Types of Inhaler Device
| Device Type | How It Works | Best For |
|---|---|---|
| Pressurised MDI (pMDI) | Press canister to release a metered puff; requires coordinated pressing and inhaling | Most adults; Ventolin Evohaler is a pMDI |
| Breath-Actuated (BAI) | Releases medication automatically when you begin to inhale | People who struggle to coordinate pMDI technique |
| Dry Powder (DPI) | Inhale sharply to draw powder into lungs; no propellant | Adults with sufficient inspiratory flow |
| Soft Mist (SMI) | Releases a slow-moving mist; easier to inhale than pMDI spray | Weak inspiratory flow; COPD |
| Nebuliser | Converts liquid to fine mist via mask or mouthpiece | Severe attacks; young children; hospital use |
Why Spacer Devices Make a Difference
A spacer is a hollow plastic chamber that attaches to your pMDI. When you press the canister, medication is released into the spacer — giving you time to inhale it without needing split-second coordination. Clinical studies show spacers can increase medication delivery to the lungs by up to 50% compared to using an MDI alone. Spacers are especially beneficial for:
- Children, who often struggle with inhaler coordination
- Elderly patients with reduced dexterity or breath control
- Anyone who finds it difficult to time pressing and inhaling simultaneously
- People using high-dose preventer inhalers (spacers also reduce the risk of oral thrush)
How Often Should You Use Your Inhaler?
- Reliever (blue/salbutamol): On demand only. Standard adult dose: 1–2 puffs up to 4 times in 24 hours. Do not use daily as routine prevention.
- Preventer (ICS): Every day as prescribed — typically once or twice daily. The protective effect is lost if you stop.
- Combination inhaler: Daily as prescribed. Continue even when feeling well.
Order Your Asthma Inhaler Online
Access Doctor is a GPhC-registered online pharmacy. Our GPhC-registered pharmacist independent prescribers review your online consultation and, if approved, dispatch your inhaler in discreet packaging — typically next day via Royal Mail Tracked 24.
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View All Asthma Treatments →Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional regarding your symptoms and treatment. In a medical emergency, call 999. This content does not replace advice from your GP or asthma nurse.
Frequently Asked Questions About Asthma Inhalers
What is the difference between a reliever and a preventer inhaler?
A reliever inhaler (blue, e.g. Ventolin/salbutamol) provides fast on-demand relief during symptoms by widening the airways within minutes. A preventer inhaler (brown or red) contains inhaled corticosteroids and must be taken daily to reduce airway inflammation over time — even when you feel well.
How often should I use my blue salbutamol inhaler?
Only when you experience symptoms or before a known trigger like exercise. Standard dose: 1–2 puffs, up to 4 times in 24 hours. If you need it more than three times a week, this indicates poorly controlled asthma and you should review your treatment with a doctor.
What is Ventolin and how does it work?
Ventolin (salbutamol) is a short-acting beta-agonist (SABA) that stimulates beta-2 receptors in airway smooth muscle, causing rapid relaxation and bronchodilation. It begins working within 3–5 minutes of inhalation. Both Ventolin and Salamol contain salbutamol 100mcg per actuation.
Do I need a spacer with my inhaler?
A spacer is strongly recommended if you use a pressurised MDI such as Ventolin Evohaler. It significantly improves medication delivery to the lungs (by up to 50%) and removes the need for perfect press-and-inhale coordination. It is especially recommended for children and elderly patients.
Can I use a Ventolin inhaler for COPD?
Yes — salbutamol (Ventolin or Salamol) is used for both asthma and COPD to relieve breathlessness and wheezing. For COPD, additional long-acting bronchodilators and inhaled corticosteroids may also be required as the condition progresses.
How do I order an asthma inhaler online safely?
Access Doctor is a GPhC-registered online pharmacy. Complete a short medical questionnaire, reviewed by our GPhC-registered pharmacist independent prescribers. If approved, your inhaler is dispensed and dispatched — typically arriving next day via Royal Mail Tracked 24.
References
- NICE. Asthma: diagnosis, monitoring and chronic asthma management (NG80). 2017, updated 2023. nice.org.uk/guidance/ng80
- BTS/SIGN. British Guideline on the Management of Asthma. 2019 (updated 2023). brit-thoracic.org.uk
- Dolovich MB, et al. Device selection and outcomes of aerosol therapy: evidence-based guidelines. Chest. 2005;127(1):335–371. PubMed
- NHS. Asthma — Treatment. nhs.uk