The leviathan label says to take on an empty stomach, at least 45 minutes prior to food. I would say to dose it similarly, but not at the same time, as massfx/hyperdrol tend to go down better with food. Maybe take the leviathan an hour before the meal, eat the meal, and then take massFX/hyperdrol dosages.
I forgot to mention in your other thread that the occasional user tends to get a tummy ache if they dose massfx/hyperdrol (or anything containing forslean) on an empty stomach.