Sterile Water Injection 20 mL Single-Dose Vials by Hospira 25/Tray (Rx)Sterile Water for Injection 20 mL by Pfizer is a pharmaceutical grade solvent used to dilute or dissolve medications for injection. It is employed when preparing intravenous, intramuscular, or subcutaneous injections and ensures proper preparation of drug solutions to maintain isotonicity and safety. This sterile water is free from antimicrobial agents and additives, making it suitable for single dose and multi dose uses in various medical settings.