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Nov 20, 2013 at 16:33 comment added Tim Lymington I have always referred to alka-seltzer tablets and the like as effervescent, though I am no pharmacist. Technically, I suppose, they don't effervesce till dropped in water; but most people would understand the usage.
Nov 20, 2013 at 11:07 history answered Kris CC BY-SA 3.0