LEAN 

Lean is a slang term for concotion which includes perscription strength cough syrup.

The cough syrup used contains codeine and promethezine, the cough syrup used in doses higher than medically recommended is mixed with other ingridients such as soft drinks like sprite, mountain dew, and candy for the sweetness.

The affects of this drug are motor-skill impairment, lethargy, drowsiness, and a dissociative feeling from all other parts of the body. Some effects can be fatal, some rappers which are users of this drug have had seizures and have even passed away.