Which of the following statements is FALSE regarding sodium polystyrene sulfonate (SPS) for the treatment of hypokalemia?

It is a potassium-removing agent.
It is not potassium selective and can cause hypomagnesemia and hypocalcemia.
The FDA first approved it for the treatment of hypokalemia in 1958.
It can only be administered orally to patients.

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Dr. L.D., Dermatologist from CT