How long does oral Kayexalate continue to work in the body?

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Hi. I had a patient with a potassium of 6.4, was given oral Kayexalate, then three days later had a potassium of 2.0. I was just wondering if anyone knows how long Kayexalate continues to work in the body, as I have had trouble finding half-life information on this drug. Thanks!

She said that it was her first experience with a bicarb drip... Don't waste a teaching moment just to be condescending.

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