I was wondering, what stops CHouji from carrying 4 pills each time?
The normal yellow, green & red combo + the antidote that Tsunade made.

Since he always carries the antidote, you could say he has an enormous strength now.
He could use it in any battle, since the effect of the red pill would be cancelled out.

I hope in the future that they don't overuse Tsunade, because you can say that she has an answer to anything...
So they won't have the characters to do something weird and eventually go to Tsunade to be healed.

It made the writer this much easier to have a reason not to kill of a character.