1.- The guy who had more poison, "I'm sorry sir, I can't help you, your gonna die." I would save the 5 who could be saved. Its not a question of morality or the right thing to do, but the logical thing to do. 5 to 1, not bad, I could live with that. "Nurse we need to be properly stocked on that antidote, so next time this won't happen!"
2.- Umm... in a medical sense, death is a natural part of life, (Yoda quote), I would let them die. "I'm sorry we have no organs for you guys......now excuse me, I have to tend to this patients broken finger."
The first ones easy, but I don't feel right about the second one. Hmmm...