Given Raerek's reluctance to discuss his problem, as well as the name, and the nature of the potion itself, it can be inferred that the potion is supposed to be a cure for impotency or lack of endurance in bed.
This section contains bugs related to Stallion's Potion. Before adding a bug to this list, consider the following:
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PC 360 PS3 Stallion's Potion can be marked as "stolen" when in the Dragonborn's inventory, despite it being a quest item obtained through legitimate means. Therefore, if they are arrested by a Hold Guard, it will be taken from their inventory and the quest "The Steward's Potion" cannot be finished until it is recovered.