Salt and water: read the package insert.

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Abstract
Salt and water are probably the most common therapeutic agents that we give to patients: used improperly, they can be lethal weapons. Rational management of fluid and electrolyte disorders requires that we think of salt (or saline) and water as drugs that have indications, contraindications, and appropriate doses. Such drug information, typically supplied in what Americans call the ‘package insert’, can be found in Tables 1 and 2.