Sterile Water for Injection, USP is a sterile, nonpyrogenic, solute-free preparation of distilled water. It is for use only as a sterile solvent or diluent vehicle for drugs or solutions suitable for parenteral administration. The pH is 5.5 (5.0 to 7.0). Sterile Water contains no Bacteriostatic, antimicrobial agent or added buffer and is intended only for single-dose injection after admixture with an appropriate solute or solution. When smaller amounts are required, the unused portion should be discarded. Sterile Water is a pharmaceutical aid (vehicle) and parenteral fluid replenisher after addition of an appropriate USP is chemically designated H2O. The flexible plastic container is fabricated from a clear multilayer plastic film. Exposure to temperatures above 25Â°C (77Â°F), during transport and storage will lead to minor losses in moisture content. Higher temperatures lead to greater losses. It is unlikely that these minor losses will lead to clinically significant changes within the expiration period.