When I was researching what Kryptonite did to Clark, I couldn't come to any solid conclusions, since it was so variable in the show. Finally, I went with weakness, pain, and loss of powers, possibly leading to unconsciousness and death, plus the most unpleasant symptoms of a migraine (yes, I'm evil).
"Oh, you can’t help that," said the Cat: "we’re all mad here. I’m mad. You’re mad."
"How do you know I’m mad?" said Alice.
"You must be," said the Cat, "or you wouldn’t have come here.”
- Lewis Carroll, Alice in Wonderland
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