Potion Black Dragon Breath

After drinking this potion, the imbiber immediately spews forth a black ichor which deals 5 points of Acid damage to all monsters in the room. This damage is not subject to any kind of damage bonus the user may possess.

The drinking and damage-dealing both occur as part of a single action. So if the consumer drinks this potion as a Free Action (e.g., by using a Pouch of Tulz or Belt of Retrieval), the drinker’s Standard Action will still be available. Thus the drinker would still be able to attack, cast a spell, etc