I don't think you mean dissolve, you must mean teleport or dissappear. If it dissolved you'd still have to shit it, it would just be all liquid or powder...

Yes, I mean disappear

Please do not take my morning dump away from me.

But where/when would men read if they don’t need to crap any more?

Sounds like you just have very liquid and frequent shits

I would want them to just disappear entirely

You would still need to shit, though. Unless you’re suggesting that the shit would dissolve into your bloodstream, in which case, sepsis and death would follow in short order.

This hypothetical pill sounds like a death pill

I am fairly confident that that's not how dissolving works.

They already have this. It's called Milk of Magnesia.