The Canadian Association of Psoriasis Patients (CAPP) supports efforts to help health systems across Canada save money and improve patients’ access to new therapies for psoriasis and psoriatic arthritis. Biosimilars can reduce costs to patients and the health system but policies designed to increase their use risk reducing treatment options for our patients. The goal of any biosimilar policy must be to improve health outcomes and quality of life, as defined by patients. CAPP urges drug plans to respect shared decision-making between a patient and their physician as they explore these policy options.

To reduce health system costs, drug plans are considering different approaches that increase the use of biosimilars. In particular, non-medical switching from a biologic to one of its biosimilars and tiering (where a patient has to fail on certain treatments before being eligible to access other treatment options) are being considered, and in some places, implemented.
Psoriasis treatment is often stepwise in nature: patients are typically only prescribed stronger treatments, such as biologics, after failing on several other medications, including topicals and oral medications. Biologics and biosimilars are important treatment options for patients who have not been able to successfully manage their disease with other medications.
Because of the role of the immune system in psoriasis and psoriatic arthritis, people can sometimes experience major differences in how they respond to a particular treatment and can build a tolerance to a specific medication and experience medication fatigue, leaving the patient in need of different treatment options. It is imperative that biosimilar policies provide multiple treatment options to patients.

Nearly 40% of psoriasis patients have lived with uncontrolled psoriasis for more than 10 years before finding a treatment that worked for them. Approximately 40% of people living with psoriatic arthritis and receiving biologic treatments continue to have persistent disease activity. Treatment decisions can be emotional and onerous for people with psoriatic disease and patients trust their physician to understand their specific history and circumstances when considering options.

To improve health outcomes and quality of life for people living with psoriasis and psoriatic arthritis, CAPP urges drug plans to:

    1. Enshrine shared decision-making between the patient and physician at the heart of any policy to impose non-medical switching and include exceptions for patients whose treatment success could be compromised if required to switch.
    2. Empower patients to start with the best option for them. if considering requiring patients to fail on one tier of medications in order to access other treatments (i.e., tiering), not just the least expensive for the drug plan.
    3. Conduct robust post-implementation surveillance to monitor for any unintended consequences, and address them publicly, with input from patients.


1. If a drug plan is considering non-medical switching, it should:

2. If a drug plan is considering tiering, it should:

3. All drug plans implementing biosimilar policies should conduct robust post-implementation surveillance that:


[1] Canadian Association of Psoriasis Patients and Canadian Psoriasis Network, Psoriasis: Journey to Stability – National Report: Canadians’ Journey Living with Psoriasis, Winter 2018, https://www.canadianpsoriasis.ca/images/pdfs/Psoriasis_Journey_to_Stability_Report_FINAL.pdf

[2] Filip Van den Bosch & Laura Coates, “Clinical management of psoriatic arthritis”, Lancet (2018) 391:2285-94. 



What is a biosimilar?
Biosimilars are medications that are similar to, but not identical versions of, an existing biologic drug. Biologic drugs, including biosimilars, are produced by living organisms, which makes it impossible for different manufacturers to make exact copies.

What is a biologic?
A biologic is a protein-based drug that is produced from living cells. They are often used in the treatment of severe psoriasis and psoriatic arthritis and are administered by injection or intravenous (IV) infusion. Biologics target the cytokines responsible for inflammation in the body (such as TNF-, IL-17 and IL-23.) These cells and proteins all play a major role in developing psoriasis and psoriatic arthritis.


Updated December 1, 2020