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A narcotic drink that makes the user feel extremely drowsy and often euphoric. Lean must contain the following in order to be authentic. Promethazine and Codeine cough syrup and sprite. The Promethazine is essentially what gives the lean affect. Many use jolly ranchers to enhance the flavor the beverage.
An open clinical trial examined a combination herbal cough syrup containing marshmallow root in 62 patients 16 to 89 years of age. Patients with irritating cough were diagnosed with a common cold (n = 29), bronchitis (n = 20), or respiratory tract diseases with formation of viscous mucus (n = 15).