This potion is an Elixir that gives the drinker advantage on checks to maintain concentration on spells until the next long rest. However, if drunk by anyone other than a Wizard or Cleric, the drinker has their movement speed reduced to half, and does not receive advantage on any rolls. 

Notes: Advantage: Constitution Saving Throws, Speed Reduction: Impose, Buff, Debuff, Movement, Consumable, Utility Potion, Combat Potion