一服,一劑
Potion \Po"tion\, n. [L. potio, from potare to drink: cf. F. potion. See {Poison}.] A draught; a dose; usually, a draught or dose of a liquid medicine. --Shak. Potion \Po"tion\, v. t. To drug. [Obs.] --Speed.
potion n : a medicinal or magical or poisonous beverage