Why an isotonic solution is used to treat dehydration?

Isotonic IV solutions restore fluid volume because they fill the tissues and maintain fluid volume more effectively than hypertonic or hypotonic solutions

For large volume replacement, isotonic or nearly isotonic solutions are used. Sodium chloride (0.9%) solution or Ringer's solution (not lactated Ringer's) is a good base solution. Potassium chloride should be added to either solution at a rate of 20 to 40 mEq/L.

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