water for injection water for injection water for injection is water of extra high quality without significant contamination. a sterile version is used for making solutions that will be given by injection. before such use other substances generally must be added to make the solution more or less isotonic. it can be given by injection into a vein, muscle, or under the skin. a non-sterile version may be used in manufacturing with sterilization occurring later in the production process. water for injectionsterile water for injectionclinical dataahfs/drugs.comfda professional drug informationlicense data us dailymed: water_for_injection atc codev07ab (who) identifierscas number7732-18-5chemspider937unii059qf0ko0rchemical and physical dataformulah2o if it is given by injection into a vein without making it approximately isotonic, breakdown of red blood cells may occur. this can then result in kidney problems. excessive amount may also result in fluid overload. water for injection is generally made by distillation or reverse osmosis. it should contain less than a mg of elements other than water per 100 ml. versions with agents that stop bacterial growth are also available. it is on the world health organization's list of essential medicines. water for injection is available over the counter in the united states. other names water for injection is also known as aqua ad iniectabilia or aqua ad injectionem.