A shaman gnoll could use it with a rabbit, or a pig, but we could find unexpected effects. For example the stomach couldn't produce more gastric juices (these are acid), and then it couldn't digest until new juices are produced by the stomach again.
Some deities could feel offended if the cleric used it at a sentient creature because the intentions could be misunderstood.
My suggestion is allowing the option of spending the spell to "load" a drink to work as potion (medicine or antidote).
Or the spell could change the state, from "poisoned" toward a softer "intoxicated".
I have just reviews the 3.5 healer class (I bought the book, nothing of pirate download) and any states aren't easy to be removed in the lowest levels. The game has been designed the PCs need a minimal level to use magic to remove those states.