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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.
Prospan Â® Cough Syrup is produced in Germany by Engelhard Arzneimittel .Cough Syrup is a natural product and contains an active ingredient, which is purely herbal.The special dried ivy leaf extract contained in ProspanÂ® contains saponins that loosen a cough.his reduces the annoying urge of wanting to cough. Prospan Â® Cough Syrup is mucolytic, spasmolytic and cough relieving. Prospan Â® Cough Syrup is free from alcohol, sugar and colourings and has a pleasant taste of cherry.