Ketotifen (Zaditor, Zaditen) shortage status

Shortage anticipated

Source: Health Canada shortage reports · Updated Jul 14, 2026

A shortage of Ketotifen is anticipated but not yet confirmed. 1 product(s) have anticipated-shortage reports on file with Health Canada.

An antihistamine used to relieve allergy symptoms, including itchy eyes.

Products affected

0 / 3

Reports on file

Shortage history

Shortage history (red bands = periods in shortage).

Reports by product

The DIN is printed on your prescription label.

Anticipated

ZADITOR

0.25MG · SOLUTION · LABORATOIRES THEA

DIN 02242324 · Disruption of the manufacture of the drug.

Resolved

ZADITEN

1MG · TABLET · TEVA CANADA LIMITED

DIN 00577308 · ended Mar 18, 2026 · Disruption of the manufacture of the drug.

Resolved

ZADITOR

0.25MG · SOLUTION · LABORATOIRES THEA

DIN 02242324 · ended Jun 19, 2025 · Delay in shipping of the drug.

Resolved

ZADITOR

0.25MG · SOLUTION · LABORATOIRES THEA

DIN 02242324 · ended Dec 19, 2024 · Delay in shipping of the drug.

Resolved

ZADITEN

1MG · TABLET · TEVA CANADA LIMITED

DIN 00577308 · ended Apr 14, 2023 · Disruption of the manufacture of the drug.

Resolved

ZADITEN

1MG · TABLET · TEVA CANADA LIMITED

DIN 00577308 · ended Jul 27, 2021 · Disruption of the manufacture of the drug.

Resolved

ZADITEN

1MG · TABLET · TEVA CANADA LIMITED

DIN 00577308 · ended Jan 13, 2021 · Disruption of the manufacture of the drug.

Resolved

KETOTIFEN OPHTHALMIC SOLUTION

0.25MG · SOLUTION · STERIMAX INC

DIN 02400871 · ended Jun 27, 2019 · Delay in shipping of the drug.

Resolved

KETOTIFEN OPHTHALMIC SOLUTION

0.25MG · SOLUTION · STERIMAX INC

DIN 02400871 · ended Aug 14, 2017 · Product is available

What's happening

A manufacturer has told Health Canada it expects supply of Ketotifen to fall short of demand. Anticipated shortages sometimes resolve without patients noticing; this page updates as soon as the status changes.

Ketotifen is classified under “ANTIHISTAMINES FOR SYSTEMIC USE” (ATC R06AX).

Recent changes

Jul 14, 2026 New report filed

Common questions

What is Ketotifen used for?

An antihistamine used to relieve allergy symptoms, including itchy eyes.

When will Ketotifen 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 Ketotifen 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.

Email alerts

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Possible alternatives in the same class (antihistamines for systemic use)

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.

Dimenhydrinate (Gravol) No current shortage Loratadine No current shortage Rupatadine No current shortage Bilastine Partial shortage 1 of 2 reported products affected Cetirizine (Extra Strength Allergy Relief) Partial shortage 1 of 15 reported products affected Diphenhydramine (Unisom Sleepgels Extra Strength) Partial shortage 2 of 9 reported products affected

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.