Trillium Drug Program (Ontario): Complete Guide
Last reviewed 2026-09-24
The Trillium Drug Program (TDP) helps Ontario households with high prescription drug costs compared to their income. After you pay an income-based deductible, the program covers eligible drugs on the Ontario Drug Benefit (ODB) formulary for the rest of the benefit year.
Who qualifies
- You have a valid Ontario health card (OHIP) and live in Ontario.
- Your prescription costs are high relative to your household income — typically more than about 4% of net household income.
- You don't already have full coverage through another part of ODB (for example OHIP+ for people 24 and under without private insurance, or Ontario Works / ODSP).
- You can apply even if you have private insurance — Trillium can cover costs your private plan doesn't.
How the deductible works
Your deductible is roughly 4% of your household's combined net income (line 23600 of your tax returns), after adjustments for household size. The benefit year runs from August 1 to July 31, and the deductible is split into four quarterly instalments. Once you've paid the instalment for a quarter, eligible drugs are covered for that quarter, with only a small co-payment (currently up to $2 per prescription) at the pharmacy.
What's covered
- Drugs listed on the Ontario Drug Benefit formulary.
- Limited Use drugs, when your prescriber confirms you meet the criteria.
- Drugs approved case-by-case through the Exceptional Access Program (EAP).
- Some diabetes testing supplies and other listed products.
How to apply
- Apply online through the Ontario government's Trillium page, or with a paper application from your pharmacy.
- List everyone in your household and give consent for the Canada Revenue Agency to confirm income.
- Include receipts for eligible drug costs if you're asking to be reimbursed for costs already paid in the benefit year.
- Renew each year — you'll receive a renewal notice before the benefit year ends.
Frequently asked questions
How much is the Trillium deductible?
About 4% of your household's net income, paid in four quarterly instalments over the August–July benefit year.
Can I use Trillium if I have private insurance?
Yes. Trillium can cover eligible costs your private plan doesn't pay, such as co-pays or annual maximums.
How long does approval take?
Processing usually takes several weeks. Keep your receipts — eligible costs paid after your coverage start date can be reimbursed.
Official sources
- Ontario.ca — Get help with high prescription drug costs (Trillium)
- Ontario Drug Benefit formulary search
This guide is general information, not medical or financial advice. Program rules and amounts change — confirm with the official source or your pharmacist.