If you take small dose of Epsom Salts (1/2 teaspoon) then, it will not have laxative effect.
You are not taking it because of laxative effect. you are suppose to take it as a dietarry supplement, because modern diet is low on magnesium.
If it does create laxative effect, decrease the amount to the point where you have no reaction!
> Is magnesium citrate the same thing?
It is not exactly the same, but can be used the same way, and is as good as Epsom Salts .