Easy NAPLEX USP 795 Practice Questions

Preparing for the NAPLEX requires a firm grasp of compounding standards, particularly Easy NAPLEX USP 795 Practice Questions which focus on nonsterile preparations. USP Chapter 795 provides the essential requirements for compounding nonsterile preparations to ensure patient safety and product quality. Whether you are calculating beyond-use dates (BUDs) or identifying the correct documentation requirements, mastering these basics is a critical step toward pharmacy licensure. Students often find that integrating these concepts with clinical knowledge, such as infectious disease therapeutics, helps create a more holistic understanding of patient care.

Concept Explanation

USP Chapter 795 is the national standard for the compounding of nonsterile preparations (CNSPs) in pharmaceutical settings. It defines the minimum requirements for the compounding process, including the environment, personnel training, documentation, and the stability of the final product. The primary goal of USP 795 is to prevent harm to patients that could result from excessive microbial growth, variability from the intended strength, or chemical/physical instabilities. Key components include the categorization of compounding into simple, moderate, and complex levels, as well as the strict adherence to Beyond-Use Dates (BUDs). If you are looking for a comprehensive overview of the entire exam, our NAPLEX Prep hub is an excellent resource to start your journey.

Compounding Category	Description
Simple	Reconstituting a commercial product or following a specific USP monograph (e.g., Captopril Oral Solution).
Moderate	Requires special calculations or procedures (e.g., Suppositories or Troches).
Complex	Requires specialized equipment, environment, or training (e.g., Transdermal patches).

According to the United States Pharmacopeia, the BUD is determined from the date the preparation is compounded. For non-preserved aqueous dosage forms, the BUD is no more than 14 days when stored in a refrigerator. For non-aqueous formulations, the BUD is no later than the time remaining until the earliest expiration date of any API or 6 months, whichever is earlier.

Solved Examples

1. Problem: A pharmacist is compounding a non-aqueous ointment using a Bulk Powder API with an expiration date of December 2025 and a base with an expiration date of June 2024. Today is January 1, 2024. What is the maximum BUD?
   Solution:
   1. Identify the rule for non-aqueous formulations: 6 months or the earliest expiration date of any component.
   2. 6 months from Jan 1, 2024, is July 1, 2024.
   3. The earliest expiration date of a component is June 2024.
   4. Since June 2024 is earlier than July 1, 2024, the BUD is June 30, 2024.
2. Problem: A prescription is received for a 1% Hydrocortisone cream made by mixing Hydrocortisone powder into a commercial moisturizing cream base. What is the BUD if stored at room temperature?
   Solution:
   1. Identify the formulation type: This is a water-containing topical/dermal semi-solid (cream).
   2. Apply the USP 795 rule: Water-containing topical formulations have a maximum BUD of 30 days.
   3. The BUD is 30 days.
3. Problem: Calculate the amount of active ingredient needed to prepare 60 grams of a 5% (w/w) salicylic acid ointment.
   Solution:
   1. Use the formula: $$\text{Weight of API} = \text{Total Weight} \times \text{Percentage}$$
   2. Substitute the values: $$60\text{g} \times 0.05 = 3\text{g}$$
   3. The pharmacist needs 3 grams of salicylic acid.

Practice Questions

1. A pharmacist is compounding an oral aqueous solution of Amoxicillin. According to USP 795, what is the maximum BUD when the preparation is stored in the refrigerator?
2. Which document must be created first before a compound is ever made, serving as the "recipe" for any future batches?
3. A technician is cleaning the nonsterile compounding area. According to USP 795, how often should the work surfaces be cleaned and sanitized?

4. A compound requires the use of a balance with a sensitivity requirement of 6 mg. What is the Minimum Weighable Quantity (MWQ) to ensure an error of no more than 5%?
5. What is the standard BUD for a non-aqueous formulation (such as a capsule) if the ingredients do not expire for another 2 years?
6. A pharmacist compounds a topical gel that contains water. What is the maximum BUD for this preparation?
7. Which of the following would be considered a "Moderate" level of compounding according to USP 795 standards?
8. If a pharmacist is using a bevinzey AI Question Generator to study for the NAPLEX, they might see questions about the Master Formulation Record. What specific information must be included in this record regarding the components?
9. True or False: Hand hygiene for nonsterile compounding must include washing hands and forearms up to the elbows with soap and water for at least 30 seconds.
10. A pharmacist is preparing a compound and notices the API has no expiration date on the bottle. According to USP guidelines, what is the maximum expiration date that can be assigned to this raw material?

Answers & Explanations

1. 14 Days: For water-containing oral formulations (solutions, suspensions), the BUD is 14 days when stored under refrigeration.
2. Master Formulation Record (MFR): The MFR is the permanent record or "recipe" that ensures consistency across different batches. The Compounding Record (CR) is the log of a specific individual batch.
3. Daily and between tasks: Work surfaces must be cleaned at the beginning and end of each shift, and after any spill or between compounding preparations with different components.
4. 120 mg: The formula for MWQ is $$\text{MWQ} = \frac{\text{Sensitivity Requirement}}{\text{Acceptable Error}}$$. In this case, $$\frac{6\text{mg}}{0.05} = 120\text{mg}$$.
5. 6 Months: For non-aqueous formulations, the BUD is the earliest expiration date of any API or 6 months, whichever is shorter.
6. 30 Days: Water-containing topical/dermal and mucosal liquid and semi-solid formulations (like gels and creams) have a BUD of 30 days.
7. Suppositories: Moderate compounding involves preparations that require special calculations or procedures, such as making a mold-based dosage form like suppositories. Mixing two creams is usually Simple.
8. Sources and Lot Numbers: While the Master Formulation Record contains the instructions, the specific Lot Numbers of the ingredients used are recorded in the Compounding Record. However, the MFR must specify the identity and amounts of all components.
9. False: While hand hygiene is critical, USP 795 specifically requires washing for at least 30 seconds, but the standard for nonsterile is typically just hands and wrists, whereas sterile compounding (USP 797) involves higher levels of scrubbing.
10. 3 Years: If a component does not have an expiration date from the manufacturer, the pharmacist should assign a conservative date, typically not to exceed 3 years from the date of receipt.

1. What is the maximum BUD for a non-aqueous oral capsule?

• A14 days
• B30 days
• C6 months
• D1 year

Frequently Asked Questions

What is the difference between USP 795 and USP 797?

USP 795 governs the standards for nonsterile compounding, such as ointments and oral liquids, while USP 797 establishes the requirements for sterile compounding, including IV medications and eye drops. The primary difference lies in the environmental controls and microbial risk levels associated with the preparation types.

Can I use a BUD longer than the USP 795 recommendations?

A BUD can only exceed the USP 795 defaults if there is valid stability data, such as a published peer-reviewed study or stability-indicating assay specifically for that formulation. In the absence of such data, pharmacists must adhere to the conservative limits set by the chapter.

What is the minimum weighable quantity on a Class A prescription balance?

For a Class A balance with a sensitivity requirement of 6 mg, the minimum weighable quantity is 120 mg to maintain a 5% error margin. This calculation is a frequent topic in NAPLEX therapeutics practice as it relates to accuracy in dosing.

How should a compounding pharmacy handle hazardous drugs under USP 795?

When compounding nonsterile hazardous drugs, pharmacies must also comply with USP Chapter 800 standards to protect personnel and the environment. This includes using dedicated equipment and specific containment primary engineering controls (C-PECs) like a redundant HEPA-filtered enclosure.

Is a sink required in the nonsterile compounding area?

Yes, a sink with hot and cold running water must be easily accessible to the compounding area for hand hygiene and equipment cleaning. It must be maintained in a clean condition to prevent cross-contamination of compounded preparations.