Can taking Milk of Magnesia daily be harmful?

I was told by my doctor to use it daily to prevent the constipation i encounter. I asked if i could use it daily without any problems and he said (quote) "yes you can use it for a year and stop or use it the rest of your life".

If taking it daily, you should also take a multi-vitamin, or just a potassium pill, or eat a banana. This is because the bowel movement associated with Milk of Magnesia removes much of the potassium in your body. So you need to replace the potassium as often as you take the Magnesia.