USP <795> Beyond-Use Dates for Water-Containing Compounded Preparations

A beyond-use date (BUD) is the date after which a compounded preparation should not be used. It is assigned to the compounded preparation, not simply copied from a manufacturer’s expiration date. The current USP <795> framework distinguishes formulations by water content, dosage form, storage, and the evidence available to support the assigned period.

Default limits to recognize

• Water-containing oral formulations: 14 days when stored at controlled cold temperature.
• Water-containing topical/dermal and mucosal liquid or semisolid formulations: 30 days at controlled room temperature or controlled cold temperature.
• Other formulation categories have different defaults; do not apply these values to nonaqueous preparations or all compounded products.

A default is a ceiling, not an automatic guarantee

The assigned BUD must not exceed the applicable USP limit and may need to be shorter because of the formulation, ingredients, packaging, preparation conditions, microbial risk, or stability information. The pharmacist must consider the specific preparation and applicable state requirements. Refrigeration does not by itself justify extending a date beyond the permitted default.

When a longer BUD is considered

USP allows a BUD supported by appropriate stability-indicating evidence and compliance with applicable requirements. A stability study should reflect the formulation, container-closure system, storage condition, and relevant quality attributes. A literature value for a different formula is not automatically transferable.

Water activity is relevant

The chapter’s classification considers water activity and formulation characteristics, not merely whether the ingredient list includes water. The compounding record and rationale should identify the applicable category, storage condition, and BUD basis. When classification is uncertain, consult the current official chapter and pharmacy policies rather than guessing from the product’s appearance.

Operational controls

1. Classify the preparation under the current USP <795> categories.
2. Determine the proper storage condition and the shortest applicable limit.
3. Label the BUD and storage directions clearly; preserve required preparation records.
4. Tell the patient how to store the product and when to discard it.
5. Follow state board rules and facility procedures that may impose additional limits.

Key takeaway

For the commonly tested water-containing categories, remember 14 days refrigerated for oral preparations and 30 days for topical/dermal or mucosal liquids and semisolids under the stated default conditions. Confirm category, storage, evidence, and current chapter wording before assigning a BUD.

Water changes the stability question

Water-containing nonsterile preparations can support microbial growth and may undergo chemical or physical change. Their BUD therefore cannot be chosen by copying the expiration date of one ingredient or by using a generic “all liquids” rule. Under USP <795>, the compounder assigns a BUD using the current chapter, formulation and stability evidence, packaging, storage, and any shorter ingredient or manufacturer limit. Aqueous preparations often require tighter controls than nonaqueous ones, but the exact permitted date depends on the preparation category and evidence. The pharmacy must use the current official chapter and its approved compounding procedure.

The worksheet or master formulation record should identify the formula, ingredients and lots, calculations, method, equipment, container, storage conditions, and assigned BUD. A water-containing preparation should not be extended just because it appears clear or has no unusual odor. A technician’s role is to follow the approved formula and capture the facts accurately; the pharmacist or authorized compounder evaluates the BUD and any stability support. For a marketed product that has been reconstituted, use the manufacturer’s instructions rather than applying the compounded-preparation rule by assumption.

Work an example without inventing a date

Imagine a clinic requests a flavored oral liquid made from tablets and a vehicle. Before assigning a date, confirm the exact formulation and concentration, whether a validated formula exists, the evidence supporting stability, the container and closure, and the required storage. Then compare the proposed date with ingredient expiration dates and any controlling manufacturer or USP limit. If documentation does not support the requested period, the preparation cannot simply inherit the longest date from one component. Ask the pharmacist to use the current chapter and evidence to establish a defensible date.

For exam purposes, remember the decision logic rather than memorizing a single number detached from context: identify whether the preparation is sterile or nonsterile; whether it contains water; what formulation category and stability data apply; which storage condition is required; and whether a shorter limit controls. Use the current USP text because standards and dates can change. Preserve the preparation record and label so that another staff member can verify both the BUD and storage condition.

Practical checks, exceptions, and exam application

When a formula is not found in an approved master formulation record, stop and refer the request rather than constructing an unsupported date. Stability publications must match the actual concentration, ingredients, container, temperature, and preparation method closely enough to support the proposed use. A study of a different vehicle or bottle is not automatically transferable. Record the source and rationale in the compounding documentation so a later reviewer can see why the date is appropriate.

Aqueous preparations also require sound compounding technique: clean equipment, accurate measurements, suitable water and vehicle, proper mixing, and a container that protects the formulation. These controls reduce contamination risk but do not create stability evidence or extend a BUD. Label storage exactly as supported. If refrigeration is required, explain that the date assumes refrigeration and investigate any temperature excursion before further dispensing.

Keep formula-specific dates separate from general training mnemonics. The official USP chapter can change and has categories, exceptions, and conditions that a short exam summary cannot reproduce. In practice, use current licensed standards and the facility’s approved procedures; in an exam question, select the option that relies on the applicable current standard and pharmacist authorization rather than a guessed fixed number.