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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.
ProspanÂ® â is a German herbal drug based on original standardized dry extract of ivy leaves (used only for ProspanÂ® production). Since it is the herbal expectorant drug with pronounced and proved broncholytic effect, ProspanÂ® is recommended for relieving any type of cough, even smokerâs cough.iabetic patients should be aware that 2.5 ml of Prospan syrup contain 0.963 g of sugar substitute sorbitol, which is equivalent to 0.08 bread units, 5 ml (1 package) of Prospan Sachet contain 1.926 g of sugar substitute sorbitol, which is equivalent to 0.16 bread units.