Modafinil MD is the same thing as Modafinil.
The only difference between the Modafinil MD and the Modafinil is that Modafinil is a generic version of the regular Modafinil and is cheaper.
The Modafinil MD may not be as strong or work as good as the regular non generic Modafinil because it's cheaper.
But if all you can afford is Modafinil MD which is cheaper than regular Modafinil then it will work pretty good.
But if you can you would likely want to get the regular non generic Modafinil because it's much stronger and would work much better.