The Stamina Potion is one of the standard potions found in Skyward Sword. When Link drinks the Stamina Potion, his stamina bar will be full and will not drop for three minutes. Having a Potion Medal in the Adventure Pouch will double this effect. This green potion can be purchased for 50 rupees at Luv and Bertie's Potion Shop in the Bazaar.
The Stamina Potion can later be upgraded to the Stamina Potion +.