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Potassium chloride is used to prevent or to treat low blood levels of potassium (hypokalemia). Potassium levels can be low as a result of a disease or from taking certain medicines, or after a prolonged illness with diarrhea or vomiting.
Stop using this medication and call your doctor at once if you have any of these serious side effects:
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confusion, anxiety, feeling like you might pass out;
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uneven heartbeat;
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extreme thirst, increased urination;
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leg discomfort;
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muscle weakness or limp feeling;
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numbness or tingly feeling in your hands or feet, or around your mouth;
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severe stomach pain, ongoing diarrhea or vomiting;
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black, bloody, or tarry stools; or
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coughing up blood or vomit that looks like coffee grounds.
Less serious side effects may include:
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mild nausea or upset stomach;
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mild or occasional diarrhea;
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slight tingling in your hands or feet; or
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appearance of a potassium chloride tablet in your stool.
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