In the pharmaceutical industry, Water for Injection (WFI) is the highest quality and most rigorously regulated grade of water used as an excipient in the production of parenteral drugs, biological products, and medical devices. It serves as the primary solvent vehicle to dissolve, dilute, and reconstitute active pharmaceutical ingredients that will be introduced directly into the human body via intravenous, intramuscular, or subcutaneous injection, requiring absolute freedom from bacterial endotoxins, chemical impurities, and microorganisms.
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