The Asthma Society of Canada
This web accessibility icon serves as a link to download essential accessibility assistive technology software for individuals with physical disabilities.
AQHI Subscribe Contact Us
About Asthma
  About Inhaled Steroids
  About Anti-Leukotrienes
How to Use Your Inhaler
Taking Control
Resources & Support

All about Anti-Leukotrienes (LTRAs)

Leukotriene Receptor Antagonists (LTRAs) are a class of oral medication that is not a steroid and constitute a preventative therapy for asthma. They may also be referred to as anti-inflammatory bronchoconstriction preventors. LTRAs work by blocking a chemical reaction that can lead to inflammation in the airways. The medication comes in different once-daily forms - tablet, chewable tablets or granules - and has few side effects.

To see the mechanism of action of leukotriene receptor antagonists, please view the presentation by clicking here.

Frequently Asked Questions About LTRAs
Q: What are leukotrienes?
A: Leukotrienes are chemical compounds that are released during the inflammatory process. They are chemical messengers that help protect the body against attacks by invaders. However, when they are a part of an allergic response, leukotrienes cause airway obstruction, mucous production, and swelling of the airways. Leukotriene modifiers block the action or production of leukotrienes, and subsequently inhibit the inflammatory process. Two types of leukotriene-based medications have been developed: leukotriene inhibitors that interfere with the actual synthesis of leukotrienes, and leukotriene antagonists that block the action of leukotrienes by interfering with receptor sites.

Q: Who should take LTRAs?
A: In the 1999 Asthma Consensus Guidelines and 2003 Updates, LTRAs are classified as medication that may be useful as add-on therapy to inhaled corticosteroids or as single agents in the management of asthma for patients who cannot or will not use inhaled corticosteroids.

Q: Are LTRAs safe for children?
A: Montelukast is the only LTRA that has been studied in children. It is indicated for pediatric patients two years of age and older with few side effects. For more detailed information on pediatric side effects, please talk to your doctor.

For more information about Anti-Leukotrienes

> > Click Here

Asthma Medications

What are the different kinds of asthma medications? Are you using your inhaler properly? What is an Asthma Action Plan and how do I get one? Learn what your medication does and how to take it properly by reading the Asthma Basics Booklet #3: Medications

> > Download PDF

Get Acrobat Reader

Brought to you by the Asthma Society of Canada

  Home | Legal & Privacy | Credits | Sponsors| Glossary| Last updated: June 2017  

Imagine Canada
The ASC is an Imagine Canada's Ethical Code charity
HCCC We subscribe to the
HONcode principles
Verify here
We subscribe to the HONcode principles of the HON Foundation. Click to verify.

DISCLAIMER: Content on this website is for information purposes only andnot a substitute for a qualified medical professional.
For specific information treatment and management your asthma and/or potential side effects of medications and
treatment, please consult your physician.