Canada's main stock index fell Thursday due to weakness in health-care and energy sectors.

The Toronto Stock Exchange's benchmark Standard & Poor's/TSX Composite Index tumbled 73.67 points or 0.48 percent to finish the day at 15,191.96.

All 10 of its main sectors ended in the red, and decliners outnumbered advancers by 2.5 to 1.

Health-care stocks tumbled worst as Valeant Pharmaceuticals stumbled 1.12 Canadian dollars, or 5.4 percent, to 19.50 Canadian dollars, while Canopy Growth Corp capsized 16 cents, or 1.8 percent, to 8.84 Canadian dollars.

Energy stocks slumped as Seven Generations Energy dropped a sharp 3.54 Canadian dollars, or 17.3 percent, to 16.97 Canadian dollars. Crescent Point Energy also dropped 44 cents, or 4.6 percent, to 9.15 dollars.

Tech stocks also fell as BlackBerry edged down 8 cents to 11.85 Canadian dollars, and Constellation Software softened 8.40 Canadian dollars, or 1.2 percent, to 695.82 Canadian dollars.

The Canadian dollar edged down 0.09 cents to 0.7947 U.S. dollar.