Answer:
Orally
Step-by-step explanation:
Lean is a combination of prescription-strength cough medicine, soft drinks, and hard, fruit-flavored candy. The prescription cough syrups used to make lean drink present the most danger because they often contain codeine, an opioid.Another active ingredient in some prescription cough syrups is promethazine, an antihistamine with potentially sedating effects.
Source: American Addiction Center