It depends on the factors and reasons for taking it. If you have a chronic deficiency then ongoing supplementation of Mg will probably not be a problem unless the reasons for that deficiency are corrected. If you are taking it for laxative reasons only, I wouldn't recommend it. There are better ways.

mag is very important and most of us here are defient.it will not hurt to take it and it helps with blood presure control and is depleted by alcohol.