The Healing Draught is a consumable item in Vermintide.
The Healing Draught can be consumed to heal yourself for a fixed amount of health. It can only be used by one of heroes
and it can heal up to 30% of maximum health.
Unlike the medkit which heals the target for 80% of its missing health, the healing draught heals the target for a fixed amount of 75 health and is unaffected by current health amount, or grimoires currently carried by the team.
Heroes on easy, normal, hard, and nightmare have 150 health, in cataclysm heroes only have 100 health.
You can't heal other players with it.
The Healing Draught will take up space in the healing item slot on your item bar, and can be dropped by picking up something to replace it on the aforementioned slot; i.e. Tomes or Medical Supplies. Unlike Medical Supplies, Healing Draughts can not be used to heal your team members, only yourself. Aside from that, another difference is that the Healing Draught heals for the same amount regardless of the state of your current health, whereas Medical Supplies heal for a higher amount the lower your health is.
According to each of the heroes reactions, the liquid apparently tastes absolutely disgusting. Bardin claims it “Tastes like krut" while Kerillian says "This mulch burns (her) throat", and hopes it heals better than it tastes. Ironically, most healing potions in other media don't go into specific tastes. But seeing how medicine generally tastes bad, and this heals actual wounds it likely wound taste aweful.