W

Water for Injection

Full name: WFI

Highly purified, sterile, pyrogen-free water meeting pharmacopeial standards (USP, EP). The reference standard for pharmaceutical-grade water used in drug manufacturing and injection preparation. When used to reconstitute peptides for immediate single-dose use, it is the preferred option. Bacteriostatic water (containing benzyl alcohol) is the preferred diluent when multi-dose use over days or weeks is intended.