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Montelukast shortage status
Partial shortage
Source: Health Canada shortage reports · Updated Jul 9, 2026
Some Montelukast products are in shortage in Canada (8 of 44 reported products), while others remain available. Your pharmacy may be able to substitute an unaffected manufacturer. The latest estimate for affected products to return is Jun 30, 2027.
In shortage since
Apr 18, 2019
Est. full return
Jun 30, 2027
Talk to your pharmacist. Pharmacists can often substitute another manufacturer's version, a different strength, or (in most provinces) adapt or renew a prescription on the spot. Your free provincial health line is 811.
Reports by product
Active shortageNAT-MONTELUKAST
10MG · TABLET · NATCO PHARMA (CANADA) INC
DIN 02522136 · since Jul 1, 2025, est. end Jun 30, 2027 · Other (Please describe in comments)
Active shortageSINGULAIR
10MG · TABLET · ORGANON CANADA INC.
DIN 02238217 · since Dec 9, 2025, est. end Mar 13, 2026 · Requirements related to complying with good manufacturing practices.
Active shortageNAT-MONTELUKAST
4MG · TABLET (CHEWABLE) · NATCO PHARMA (CANADA) INC
DIN 02522101 · since Apr 30, 2024, est. end Dec 31, 2026 · Other (Please describe in comments)
Active shortageNAT-MONTELUKAST
5MG · TABLET (CHEWABLE) · NATCO PHARMA (CANADA) INC
DIN 02522128 · since Apr 30, 2024, est. end Dec 31, 2026 · Other (Please describe in comments)
Active shortageACH-MONTELUKAST
10MG · TABLET · ACCORD HEALTHCARE INC
DIN 02379236 · since May 3, 2024, no end estimate · Requirements related to complying with good manufacturing practices.
Active shortageJAMP-MONTELUKAST
4MG · TABLET (CHEWABLE) · JAMP PHARMA CORPORATION
DIN 02442353 · since May 31, 2022, est. end Dec 31, 2023 · Other (Please describe in comments)
Active shortageJAMP-MONTELUKAST
5MG · TABLET (CHEWABLE) · JAMP PHARMA CORPORATION
DIN 02442361 · since May 12, 2022, est. end Dec 31, 2023 · Other (Please describe in comments)
Active shortageMONTELUKAST
4MG · TABLET (CHEWABLE) · SANIS HEALTH INC
DIN 02379317 · since ?, no end estimate · Disruption of the manufacture of the drug.
Active shortageMONTELUKAST
4MG · TABLET (CHEWABLE) · SANIS HEALTH INC
DIN 02379317 · since Apr 18, 2019, no end estimate · Disruption of the manufacture of the drug.
AnticipatedSINGULAIR
5MG · TABLET (CHEWABLE) · ORGANON CANADA INC.
DIN 02238216 · Delay in shipping of the drug.
ResolvedAPO-MONTELUKAST
10MG · TABLET · APOTEX INC
DIN 02374609 · ended Feb 26, 2026 · Disruption of the manufacture of the drug.
ResolvedAPO-MONTELUKAST
5MG · TABLET (CHEWABLE) · APOTEX INC
DIN 02377616 · ended Feb 26, 2026 · Disruption of the manufacture of the drug.
Showing 12 of 60 reports. All reports are on file with Health Canada.
What's happening
Montelukast is currently affected by 8 active shortage reports filed with Health Canada by NATCO PHARMA (CANADA) INC, ORGANON CANADA INC., ACCORD HEALTHCARE INC, JAMP PHARMA CORPORATION and 1 others.
The reported causes are: other (please describe in comments); requirements related to complying with good manufacturing practices; disruption of the manufacture of the drug. Manufacturers must report shortages, but end-date estimates are their own projections and often move.
If your usual product is affected, a pharmacist is the fastest route to a solution: they can dispense an unaffected manufacturer's equivalent when one exists, and in most provinces can adapt doses or substitute a therapeutic alternative without a new appointment.
Montelukast is classified under “OTHER SYSTEMIC DRUGS FOR OBSTRUCTIVE AIRWAY DISEASES” (ATC R03DC).
Recent changes
Common questions
When will Montelukast be back in stock in Canada?
The latest manufacturer estimate is Jun 30, 2027. Estimates are self-reported and often slip; this page updates automatically when they change.
Why is Montelukast in shortage?
See the reports above; manufacturers must state a reason (most commonly manufacturing disruption or a surge in demand) when filing with Health Canada.
What can my pharmacist do about it?
Often quite a lot: substitute an equivalent product from an unaffected manufacturer, adjust quantities, or in most provinces adapt or renew prescriptions on the spot. Call your pharmacy before visiting, and call 811 for free health advice.
Guides: what to do when your medication is in shortage · how to read shortage reports
Data reflects reports manufacturers are legally required to file with Health Canada, republished with per-drug aggregation by rxstat. Estimated end dates are supplied by manufacturers and frequently change. This page describes drug supply only and is not medical advice; never stop or switch a medication without speaking to your pharmacist or prescriber.