From the TS site:
Superdrol vs Dymethazine
Dymethazine is nearly identical to Superdrol, except it’s two (as opposed to one) superdrol molecules attached to each other, now based on this you may be thinking that Dzine is twice as powerful as Superdrol, this is not the case. Your bodies stomach acid separates these two molecules prior to absorption, so it becomes a single molecule just with two potential pathways, despite this difference Superdrol remains the more powerful compound.
The one advantage that Dymethazine has over Superdrol is the less likelihood of side effects or in the event of side effects being present they’re typically more manageable with dZine/dymethazine. Don’t take this as it being side-effect free, Dymethazine is an incredibly potent compound and carries the same risks as any other powerful anabolic steroid or pro-hormone.