What does lean even do?

I just made some and drank it.. and the only thing I feel is a little lightheaded and hyper? What is it supposed to do?

Kill you .

What are you even talking about ??

-Promethazine w/Codeine VC <- Sizzurp (active ingredient)
-Original Sprite Soda <- Mixing ingredient (although different flavors of sprite are now used, such as sprite remix)
-Jolly rancher candy <- Flavor additive