I presume that you're advocating using medication for suicide, with this non-question.
Frankly, as far as I can tell after over a quarter of a century of practicing medicine, there's really nothing dignified about dying, no matter how it happens. I've seen quite enough of it, from an incredible number of different causes including an assortment of modes of suicide, and from what I've seen, you're no more dignified when you've died by suicide than when you've died by, say, cancer or Alzheimer's or renal failure.
You're just dead.
That's hardly dignified.
Dignity isn't running away from reality, which suicide does. Dignity is handling what you're faced with, showing courage and endurance to the last breath. I've seen people that have done that--faced their inevitable death with real dignity--and the memory of their last hours (as a physician, I often am present during them, you understand) is a treasure that you're obviously incapable of imagining.
Pardon the tirade--but it seems relevant.
A quarter of a century and more as a physician, dealing with death and dying...