Asthma reliever vs preventer – the difference
Reliever and preventer asthma inhalers have different jobs. Learn how to tell them apart and why relying on one role alone can be unsafe.
Relief now and prevention later are different goals
A reliever inhaler is intended to ease airway narrowing during symptoms, while a preventer or controller is taken as prescribed to reduce inflammation and future flare-ups. Some modern plans use a combination approach, so the label and written action plan matter more than the colour or shape of the device.
Questions that prevent mix-ups
- Which inhaler is for sudden symptoms?
- Which one is taken regularly, even on a good day?
- What is the maximum use in the written action plan?
- When should the clinic review symptoms or technique?
- What should happen if the inhaler is empty or unavailable?
Examples of inhaler medicines in the formulary:
Salbutamol (Inhaler) — Ventolin, Asthavent, Cipla Salbutamol, Aerolin
Asthma (reliever); COPD (reliever); acute bronchospasm
Beclometasone — Beclate, Becotide, Clenil, Aerobec
Asthma — inhaled corticosteroid preventer
Budesonide / Formoterol — Symbicort
Asthma (maintenance and reliever therapy — MART); COPD maintenance
Make the roles visible
- Write reliever or preventer on the medicine list using the clinician's wording.
- Store the action plan with the inhalers.
- Practise the technique while well, not for the first time during an attack.
- Record increasing symptoms or frequent reliever use for a review.
Do not substitute one role for another
Common questions
- What is the difference between an asthma reliever and preventer?
- A reliever is used for symptom relief according to the action plan. A preventer or controller is used as prescribed to reduce inflammation and future symptoms.
- Can I use my preventer for an asthma attack?
- Follow the exact written asthma action plan because inhalers differ. If you are unsure or symptoms are severe, contact a health professional or emergency services.
Sources
- Primary Healthcare STG and EML, Appendix II: Respiratory devicesNational Department of Health, South Africa
- Primary Healthcare Standard Treatment Guidelines and Essential Medicines ListNational Department of Health, South Africa
Last reviewed 26 August 2026.