Many seniors get cheaper medicine from Canada. That might become harder.

Linda Klonsky usually orders her prescription eye drops from a Canadian pharmacy that charges $250 for a three-month supply.

But that came to an abrupt halt late this summer when it came time for her to reorder, as the Trump administration’s latest trade edict prompted dozens of international postal services to suspend shipments to the United States. With little choice, the 75-year-old turned to a CVS near her home in Silver Spring, Maryland, and bought 30 days’ worth of similar drops for $740 — nearly nine times what she usually pays.