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 guards, it will be taken from their inventory and the quest, Bothela's Discreet Delivery, cannot be finished until it is recovered.