The PHB description of a Potion of Healing states:
A character who drinks the magical red fluid in this vial regains 2d4+2 hit points. Drinking or administering a potion takes an action.
My question is does this final sentence apply to all potions or just healing potions.
The DMG Description of a Potion of Healing does not explicitly specify that it requires an action to drink or administer.
The DMG p. 141 states that:
If an item requires an action to activate, that action isn't a function of the Use an Item action...
But the "if" there clearly implies that there are magic items that do not require an action to activate.
The section on consumables on the same page says nothing about how long an item takes to activate.
We know that one could, for example, "drink all the ale in a flagon" as a free object interaction (PHB p. 190) but we know that a Healing Potion, at least, is an exception to that rule and always requires a full Action to consume.
This came up at the table with a potion of fire breathing. I made an at-the-table ruling that since healing potions require an action to consume, that one would as well. But is there clear guidance somewhere in the rules that I've missed? Or are we meant to take the final sentence of the PHB description of a Potion of Healing as the general rule?