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Very clean, sterile water

Water for injection is water of extra high quality without significant contamination.[1] A sterile version is used for making solutions that will be given by injection.[2] Before such use other substances generally must be added to make the solution isotonic.[3] Isotonic solutions containing water for injection can be given by injection into a vein, muscle, or under the skin.[4] A non-sterile version may be used in manufacturing with sterilization occurring later in the production process.[5]

The primary use of sterile water for injection is as an ingredient for dilution of other medications (aseptic preparation of parenteral solutions).[6] If it is given by injection into a vein without making it approximately...