Consider a medical alert or a buddy system.
Keep a fire extinguisher and smoke detector on every floor.
Never smoke when alone or in bed.
Always get up slowly after sitting or lying down. Take your time, and make sure you have your balance.
Wear proper fitting shoes with low heels.
Use a correctly measured walking aid.
Remove or tack down all scatter rugs.
Remove electrical or telephone cords from traffic areas.
Avoid using slippery wax on floors.
Wipe up spills promptly.
Avoid standing on ladders or chairs.
Have sturdy rails for all stairs inside and outside the house, or, if necessary, purchase a stair lift.
Make sure that staircase steps should have a non-slip surface.
Use only non-glare 100 watt or greater incandescent bulbs (or the fluorescent equivalents.)
Make sure that all stair cases have good lighting with switches at top and bottom.