heroic dose n. a quantity of a medical drug sufficient to endanger a person; (hence) a quantity of a recreational drug sufficient to achieve the maximum possible psychedelic or psychotropic effects; an excess of any substance or behavior. Editorial Note: This is related to senses of heroic defined as “impressive in size or scope” and “showing extreme courage; especially of actions courageously undertaken in desperation as a last resort.” (source: Double-Tongued Dictionary)