Q（Question）

When a physician or pharmacist requests quality-related information not covered by the approved specifications, such as stability of uncoated tablets in single-dose packaging, stability when crushed, or compatibility when multiple drugs are mixed, what information may be provided?

A（MHLW answer）

There is no objection to providing, in accordance with the conditions of the Guidelines, in-house materials on quality-related matters such as stability of uncoated tablets in single-dose packaging, stability when crushed, and compatibility when multiple drugs are mixed, provided the company has determined that the provision complies with the Guidelines.

When providing such information, it is necessary to take care to provide accurate information based on scientific and objective evidence, including providing data that includes test conditions and methods.

Items requiring particular attention: (4), (7)

So what (meaning): In-house quality data on single-dose packaging, crushing, or drug compatibility may be provided after internal Guideline-compliance review, but data must include test conditions and methods — results-only communication is not acceptable.

So why (rationale): Dispensing practice frequently requires quality information not in the package insert; mandating disclosure of test conditions and methods ensures the scientific transparency that allows healthcare professionals to evaluate the data appropriately.

Commentary — background, application, practical notes

Dispensing operations such as single-dose packaging, crushing, and compatibility testing fall outside approved product specifications. Depending on the formulation, enteric coatings or extended-release mechanisms can be disrupted, altering the absorption profile or causing active ingredient degradation. The absence of a 'do not crush' instruction in the package insert does not imply safety for all operations, and pharmacists frequently need company test data to determine whether a specific preparation technique is feasible at their institution. Q7 permits provision of such quality information even when it comes from in-house sources, provided test conditions and methods are disclosed.

Typical requests come from pharmacists preparing multi-drug single-dose packages for nursing home or home healthcare patients, or from compounding pharmacies seeking compatibility data when combining specific drug products. These inquiries are usually handled by the medical information department. Where no test has been conducted for a given combination, the company must honestly respond 'no data available'; speculative answers such as 'it should be acceptable' are not permissible.

The most frequent error is conveying only the conclusion of a quality test while omitting the conditions under which it was conducted — temperature, humidity, storage conditions, and measurement time points. Quality test results are highly condition-dependent: a pharmacist or physician needs to know whether a stability result obtained at 25°C/60% RH is applicable to their actual storage environment, such as a hot and humid hospital room. Providing results without conditions deprives the recipient of the information needed to evaluate applicability appropriately and does not satisfy the requirement for accurate, scientifically grounded information.