Montelukast helps many people control asthma and allergy symptoms.
It works by blocking leukotrienes — inflammatory chemicals that tighten airways and cause swelling.
Doctors often prescribe it for long-term asthma control and for seasonal or year-round allergic rhinitis. You take it by mouth, usually once a day, and it can be used for adults and children with doses that vary by age.
Most adults take 10 mg nightly. Children get lower doses: for ages 6 to 14 the common dose is 5 mg, and younger children get 4 mg chewables or granules based on weight. Always follow your prescriber's instructions. Montelukast is not a rescue inhaler; it will not stop an asthma attack already happening. Keep a fast-acting rescue inhaler on hand and use montelukast only as directed.
Common side effects include headache, stomach pain, and tiredness. A small number of people report mood changes, agitation, or sleep problems. If you notice sudden behavior shifts, worsening depression, or suicidal thoughts, call your healthcare provider right away. Those serious neuropsychiatric effects are rare but worth watching.
Montelukast has few drug interactions, but tell your doctor about all medicines you take, including herbal products. If you have liver problems, your provider may need to check liver tests before and during treatment. Pregnant or breastfeeding people should discuss risks and benefits with their clinician.
Where to buy montelukast safely?
You need a valid prescription in Canada and most other countries. Use licensed pharmacies — either your local pharmacy or a verified online Canadian pharmacy that shows licensing and pharmacist contact details. Avoid sites that sell without prescriptions or offer suspiciously low prices. Look for secure checkout, clear return policies, and customer support.
If you miss a dose, take it as soon as you remember that day. Do not double up the next day. Stopping montelukast suddenly can lead to return of symptoms; talk to your doctor before stopping, especially if your asthma has been stable on the medicine.
A few practical tips: take montelukast at the same time each evening to build a routine. If you use inhaled steroids or other asthma meds, montelukast may let you reduce steroid side effects but only on your doctor’s guidance. Keep an eye on mood and sleep in children and teens; caregivers should report changes early.
Questions to ask your prescriber: Why is montelukast the best choice for my allergy or asthma? What dose fits my age and weight? What signs mean I should stop and seek help? With those answers you get safer treatment and clearer expectations.
Also consider asking about alternatives if montelukast doesn't help. Some people respond better to inhaled steroids, nasal steroid sprays, or combination therapies reviewed by a doctor. Store montelukast at room temperature away from moisture and heat, and keep childproof caps on medication. Check the expiry date before use, especially with travel pills in the pack. If cost is a concern, ask the pharmacist about generics, discount cards, or provincial drug plans that may help cover the price. Stay informed.
