How to Help Your Patients Find Sterile Water for Injection In Stock: A Provider's Guide

For patients on home infusion therapy, Sterile Water for Injection (SWFI) isn't a background supply item—it is a front-and-center medical need. When SWFI is unavailable, patients cannot reconstitute their injectable medications, potentially delaying critical antibiotic therapy, biologics, or hormone treatments. As a prescriber or pharmacist, you play a pivotal role in helping patients navigate this ongoing shortage.

This guide provides actionable steps you can take to help your patients locate SWFI in stock, work through alternatives, and avoid dangerous substitutions.

Step 1: Confirm Your Patient's Specific SWFI Need

Not all patients who need injectable medications require the same SWFI product. Before searching for supply, clarify:

Which vial size is needed (2 mL, 5 mL, 10 mL, 20 mL, 30 mL, 50 mL, 100 mL)?

Does the drug require preservative-free SWFI, or can Bacteriostatic Water (BWFI) be used?

Is the patient a neonate, infant, or immunocompromised—populations with heightened sensitivity to diluent substitutions?

What NDC code does the patient's current supplier or pharmacy stock?

Step 2: Check the FDA Drug Shortage Database

Direct patients—and check yourself—at the FDA Drug Shortage Database (accessdata.fda.gov/scripts/drugshortages). Search for 'Sterile Water for Injection' to see which NDC codes are currently available versus limited, which manufacturers are impacted, and any estimated recovery timelines. In 2026, some product codes remain on limited availability through September 2026, while others are available with allocation restrictions.

Step 3: Recommend medfinder for Pharmacy Location

medfinder is a service that calls pharmacies on behalf of patients to check whether a specific medication is in stock. Rather than having your patient (or your staff) call every local pharmacy, medfinder automates this process and texts the patient a list of pharmacies that can fill their prescription. Providers can learn more about integrating medfinder into their practice at medfinder.com/providers. It is a paid service and particularly valuable for patients with limited mobility or transportation access who cannot physically visit multiple pharmacies.

Step 4: Contact Specialty and Infusion Pharmacies Directly

Retail pharmacies are rarely the right source for SWFI—it is primarily a clinical supply item. For patients on home infusion, their infusion pharmacy should be the first call. If the infusion pharmacy is on allocation, escalate to:

Compounding pharmacies: Often maintain SWFI as a critical ingredient for sterile preparations and may have access to supply channels unavailable to retail.

Hospital pharmacy: If your patient is affiliated with a hospital system, the pharmacy may be able to source SWFI through GPO (Group Purchasing Organization) contracts.

Multiple distributors: Recommend the patient's infusion provider check multiple wholesale distributors (Mckesson, AmerisourceBergen, Cardinal Health) as allocation levels vary by distributor.

Step 5: Consider Alternative Diluents (Pharmacist-Led Decision)

When SWFI is truly unavailable, the pharmacist should lead the decision on alternative diluents based on drug-specific stability and compatibility data. The most common approved alternatives are:

Bacteriostatic Water for Injection (BWFI): Appropriate for most adult patients when the prescribing information or published literature supports it. Contraindicated in neonates and for intrathecal/epidural routes.

0.9% Sodium Chloride Injection: Supported by published literature for many antibiotics. Confirm concentration compatibility to avoid crystallization risk.

Commercially premixed formulations: The preferred alternative for many hospital antibiotics. Review formulary and update order sets to route orders toward premixed products where possible.

Step 6: Document the Clinical Decision

Whenever a diluent substitution is made due to shortage, document the clinical rationale in the patient record. This protects the provider, ensures continuity of care if the patient transitions to another facility or prescriber, and creates an audit trail that may be valuable for quality review. Note: neither the FDA nor pharmaceutical manufacturers can make official recommendations outside product labeling, so substitution decisions must be grounded in clinical pharmacokinetic and stability literature.

What to Tell Patients Who Are Worried

Many patients on home infusion therapy are anxious about medication supply disruptions. Key messages for provider-patient communication:

The clinical team is monitoring supply and has a plan for managing shortage situations.

Any change in diluent will be reviewed by a pharmacist for compatibility with their specific medication.

They should never attempt to source alternative diluents on their own without guidance—tap water, distilled water, and irrigation water are not safe substitutes.

medfinder can help them locate pharmacies with stock of their exact medication and diluent.

For a deeper clinical review of the shortage, see our provider article: Sterile Water for Injection Shortage: What Providers and Prescribers Need to Know in 2026.