Potassium cl er?

Could you clarify what you mean by “Potassium cl er”? A few common possibilities are:

1) Potassium chloride (often abbreviated “KCl”)
2) “Potassium chloride ER” (extended-release)
3) A specific product/brand name that starts with “Potassium cl er”

If you tell me which one you mean (and, if relevant, the brand name or strength like 10 mEq, 20 mEq, 600 mg, etc.), I can give the correct information—such as what it’s used for, how ER differs from immediate-release, typical dosing and cautions, and common side effects.