Source: Health Canada shortage reports · Updated Jul 29, 2026
Methacholine Chloride is in a widespread shortage in Canada. 2 of 2 reported products are affected. Manufacturers have not committed to a recovery date.
A diagnostic agent inhaled during lung function testing to help diagnose asthma.
Products affected
2 / 2
In shortage since
Apr 30, 2022
Reports on file
7
Talk to a pharmacist
Pharmacists can substitute an unaffected manufacturer's version, adjust strengths, and in most provinces adapt or renew a prescription on the spot.
Independent services, not affiliated with rxstat; referral fees may apply. Free options exist depending on your province. In an emergency call 911; free health advice at 811.
Shortage history
Shortage history (red bands = periods in shortage).
Reports by product
The DIN is printed on your prescription label.
Active shortage
METHACHOLINE OMEGA
1600MG · POWDER FOR SOLUTION · OMEGA LABORATORIES LIMITED
DIN 02263912 · since May 1, 2026, no end estimate · Disruption of the manufacture of the drug.
Active shortage
METHACHOLINE OMEGA
100MG · POWDER FOR SOLUTION · OMEGA LABORATORIES LIMITED
DIN 02263890 · since Apr 30, 2022, no end estimate · Shortage of an active ingredient.
Resolved
METHACHOLINE OMEGA
1600MG · POWDER FOR SOLUTION · OMEGA LABORATORIES LIMITED
DIN 02263912 · ended Sep 3, 2025 · Disruption of the manufacture of the drug.
Resolved
METHACHOLINE OMEGA
1600MG · POWDER FOR SOLUTION · OMEGA LABORATORIES LIMITED
DIN 02263912 · ended May 12, 2023 · Shortage of an inactive ingredient or component.
Resolved
METHACHOLINE OMEGA
100MG · POWDER FOR SOLUTION · OMEGA LABORATORIES LTD
DIN 02263890 · ended Dec 21, 2018 · Disruption of the manufacture of the drug.
Resolved
METHACHOLINE OMEGA
1600MG · POWDER FOR SOLUTION · OMEGA LABORATORIES LTD
DIN 02263912 · ended Sep 21, 2018 · Disruption of the manufacture of the drug.
Resolved
METHACHOLINE OMEGA
100MG · POWDER FOR SOLUTION · OMEGA LABORATORIES LTD
DIN 02263890 · ended Sep 21, 2018 · Disruption of the manufacture of the drug.
What's happening
Methacholine Chloride is currently affected by 2 active shortage reports filed with Health Canada by OMEGA LABORATORIES LIMITED.
The reported causes are: disruption of the manufacture of the drug; shortage of an active ingredient. 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.
Methacholine Chloride is classified under “OTHER DIAGNOSTIC AGENTS” (ATC V04CX).
Recent changes
No changes recorded yet.
Common questions
What is Methacholine Chloride used for?
A diagnostic agent inhaled during lung function testing to help diagnose asthma.
When will Methacholine Chloride be back in stock in Canada?
Manufacturers have not provided a reliable end date. This page updates automatically as soon as an estimate is filed.
Why is Methacholine Chloride 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.
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Drugs in the same therapeutic class, best-supplied first. These are not automatic substitutes: only your pharmacist or prescriber can judge whether a switch makes sense for you.
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.