Black Dog Question

[ATHATH]

One of the abilities of the Black Dog PrC is this:

"Dhurinda's Trick (Su): At 2nd level, you learn to magically apply an ingestible poison to nearby food or liquid by expending one use of your prestidigitation or purify food and drink ability. The poison you wish to use must be on your person, and the target object must be visible and within 25 feet + 5 feet per class level. Magic food or liquid (including potions) gets a Will save (DC 10 + your class level + your Cha modifier) to resist the effect, with the dose of poison expended whether used successfully or not. Dhurinda's trick is a full-round action. If anyone is directly observing you, you can conceal your action with a Sleight of Hand check opposed by the observer's Spot check."

Can one use this ability to remove any ingested poisons that are in your body (as in, inside of your stomach or bloodstream)?

[Venger]

One of the abilities of the Black Dog PrC is this:

"Dhurinda's Trick (Su): At 2nd level, you learn to magically apply an ingestible poison to nearby food or liquid by expending one use of your prestidigitation or purify food and drink ability. The poison you wish to use must be on your person, and the target object must be visible and within 25 feet + 5 feet per class level. Magic food or liquid (including potions) gets a Will save (DC 10 + your class level + your Cha modifier) to resist the effect, with the dose of poison expended whether used successfully or not. Dhurinda's trick is a full-round action. If anyone is directly observing you, you can conceal your action with a Sleight of Hand check opposed by the observer's Spot check."

Can one use this ability to remove any ingested poisons that are in your body (as in, inside of your stomach or bloodstream)?

First off, +5 for creativity.

The answer is no. Once an ingested poison is ingested, it activates, applies its initial effect to you, and can't be used again. The same way you can't go around the battlefield and harvest injury poison from the blood of people you've killed, you can't upcycle poison you ate.