McKesson Specialized Distribution (MSD) is recalling one lot ( 1N81H ) of Verkazia (cyclosporine) eye drops after certain vials from the lot were found to contain particulate matter. The manufacturer, Santen Inc., determined the particles were a crystalized form of the active drug ingredient, cyclosporine. The particulate matter may irritate the surface of the eye . Solidified cyclosporine may also reduce the concentration of the drug in the solution, which may reduce the treatment’s effectiveness. MSD, the Canadian importer, also recalled one lot (1N80H) of Verkazia in August 2021 due to the potential presence of particulate matter, which was identified during routine testing. Santen Inc. continues to investigate the cause of this issue and will report its findings to Health Canada. Verkazia is a prescription drug used in children and adolescents from 4 to 18 years of age to treat a severe form of eye allergy called “vernal keratoconjunctivitis.” Health Canada is monitoring MSD’s recall. If additional safety information is identified, Health Canada will take appropriate action and inform Canadians as needed.