Water for Injection differs from sterilized distilled water as it is free from

Explanation

Water for Injection (WFI) is prepared to stringent requirements concerning microbial endotoxins/pyrogens. Ordinary sterilisation may kill microorganisms but does not necessarily destroy bacterial endotoxins, which can remain pyrogenic. That is why “sterile” and “pyrogen-free” are not interchangeable concepts—a highly testable distinction in pharmaceutics.