The Toronto Stock Exchange's benchmark Standard & Poor's/TSX Composite Index slumped 200.27 points, or 1.29 points, to finish the day at 15,317.13 points, the lowest level since April with 389 million shares traded.
The Canadian dollar edged up 0.09 cents to 0.7697 U.S. dollar.
Among the health-care group, Aurora Cannabis Inc. fell 3.88 percent to 12.62 Canadian dollars while Aphria Inc. lost 1.79 percent to 19.70 Canadian dollars.
Of the tech-group, Bombardier Inc. dropped 3.29 percent to 3.82 Canadian dollars.
Barrick Gold Corp. shot up 9.53 percent to 16.44 Canadian dollars.