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Marie  Lafleur

Marie Lafleur

Partner Fasken
Biologicals, a new class of pharmaceutical products, are booming in Canada.
Jurisdiction Quebec, 1983
Language(s) French, English
Office(s) Montreal

Marie Lafleur is a seasoned intellectual property litigator. She regularly appears before the courts in proceedings under the Patented Medicines (Notice of Compliance) Regulations and litigation concerning pharmaceutical patent infringement or invalidity.  Her expertise encompasses biologicals and biosimilars.


Marie has represented numerous companies in proceedings to prevent the Minister of Health from issuing Notices of Compliance that would allow generic versions of patented drugs to be sold, including citalopram, escitalopram, doxylamine/pyridoxine, cyclosporin, omeprazole, diltiazem, divalproex and terazosin.  

She has also successfully filed numerous applications to add or remove patents from the Health Canada register.  She was involved in many applications for judicial review of various decisions by provincial and federal health ministers.

Marie’s expertise covers every extraordinary remedy, particularly seizures before judgment and injunctions, and she fully masters the range of alternative dispute resolution mechanisms available.

2017 IAM Patent 1000 Recognized by IAM Patent 1000 – The World’s Leading Patent Professionals 2017
2015 IAM Patent 1000 Recognized by IAM Patent 1000 : Handling crucial proceedings for Duchesnay and LEO Pharma, Julie Desrosiers and Marie Lafleur “are really phenomenal, have a great work ethic and are creative in their approaches.” “Desrosiers has a deep understanding of our technology, which enables her to mount the best defences. Lafleur has spent many years serving the drug industry and knows it inside out.” (2015)


  • Various courses, D.E.S.S., Drug Development, Faculty of Pharmacy University of Montréal
  • M.B.A. Concordia University
  • BCL McGill University
  • LLB McGill University

Memberships & Affiliations

  • Member, Québec Bar
  • Member, Bar of Montréal
  • Member, Canadian Bar Association
  • Fellow Member, Intellectual Property Institute of Canada
Data Protection location location Montréal
Fasken Training Day Program
Best Practices in NOC proceedings location location Ottawa