A potion (from Latin potio "drink", in turn derived from Greek poton "that which one drinks") is a consumable magical medicine drug or poison.
What about a substance that is a consumable magical medicine drug or poison? For example, alcohol is a potion that increases a user's strength, but also decreases a user's attack (hence, it's a poison and medicine at the same time). But ammonia can increase a user's strength, if sniffed in its crystalline form. What's the correct term?