In the next content update, elixirs (and enhancers) will now stack and reset properly if used in conjunction with other buffs/debuffs that affect armor, damage, speed, luck, or experience. For example, if you are using a 30m 2x speed elixir, and you get a 5 second half-speed debuff on you, you'll be at 1x speed (2 times 0.5), and when the debuff wears off, your speed will be set back to 2x.

Luck elixirs will also now stack with the Big/Little Luck. Previously, it chose the larger percentage of the two.

-ALS