Talk:Potion of Fortitude/@comment-77.175.144.63-20190125193315/@comment-38062337-20190125201720

Additional HP from Constitution is calculated any time the stat changes; so like if you had a 5th level Fighter with 10 CON and drank this potion, you'd gain 20 max HP (4 bonus HP for 5 levels) for the duration of the potion. If you leveled up while it was active you'd get the extra HP for your new level but it would go away when the duration was over. It's not super useful but there are some characters they work alright on, like Dorn or Shar-Teel.