1.4 Documentation, Master Formulation Records, and Compounding Records

1.4 Documentation, Master Formulation Records, and Compounding Records

In pharmaceutical compounding, documentation serves as the ultimate proof of quality, safety, and regulatory compliance. The quality adage—"If it is not documented, it cannot be demonstrated"—captures the operational importance of complete, traceable records. Compounding documentation establishes traceability from raw chemical receipt to final patient dispensing. This section focuses on the two foundation documents of compounding: the Master Formulation Record (MFR) and the Compounding Record (CR), along with raw material sourcing and percentage yield calculations.

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The Master Formulation Record (MFR): The Master Recipe

A Master Formulation Record (MFR) is a master document that serves as the official, standardized recipe for a compounded nonsterile preparation (CNSP). An MFR must be created and approved by the Designated Person or compounding pharmacist before compounding any preparation for the first time.

The MFR guarantees that every time a specific compound is prepared—regardless of which qualified technician mixes it—the exact same ingredients, equipment, procedures, and quality standards are followed.

Required Components of a Master Formulation Record

According to USP Chapter <795>, an MFR must contain the following mandatory elements:

1. Official Name, Strength, and Dosage Form: Clear, unambiguous identification (e.g., Progesterone 200 mg Rectal Suppositories).
2. Master Formula Ingredient List: Complete list of all active pharmaceutical ingredients (APIs) and excipients, specifying chemical names, exact quantities, and quality grade (e.g., USP/NF).
3. Step-by-Step Compounding Instructions: Detailed, sequential mixing instructions, including order of mixing, heating temperatures, mixing speeds, and specific equipment required.
4. Equipment List: Specific balances, mortar types, ointment mills, or molds required.
5. Container-Closure Specifications: Specific packaging required to maintain stability (e.g., Amber light-resistant glass bottle with child-resistant cap).
6. Beyond-Use Date (BUD) & Storage Assignment Rationale: Assigned BUD and storage conditions, accompanied by documented scientific rationale (e.g., USP <795> default table or specific stability study citation).
7. Quality Control (QC) Procedures: Mandatory physical checks required prior to release (e.g., pH testing, weight variation check, visual clarity, color uniformity).
8. Labeling and Special Handling Statements: Required warning labels (e.g., "Keep Out of Reach of Children," "Refrigerate," "Shake Well Before Use").

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The Compounding Record (CR): The Batch Execution Log

While the MFR is the permanent blueprint, a Compounding Record (CR) is the individual, batch-specific execution log created every time a compound is prepared. The CR documents the actual execution of the compounding event, recording the specific raw materials used, real-time measurements, and operational signatures.

Required Components of a Compounding Record

According to USP Chapter <795>, a CR must record the following elements:

1. Official Name, Strength, and Dosage Form: Matching the reference MFR.
2. Master Formulation Record Reference: Cross-reference link or MFR number.
3. Internal Lot Number: Unique control number assigned specifically to this batch for tracking and recall purposes.
4. Specific Raw Material Data: For every ingredient used:
   • Chemical name and manufacturer;
   • Manufacturer lot number;
   • Ingredient expiration date.
5. Actual Measured Quantities: Real-time weighed or volumetric measurements recorded during compounding.
6. Calculated Yield & Percent Yield: Theoretical yield, actual final yield, and calculated percent yield.
7. Assigned Beyond-Use Date (BUD) & Storage: Final BUD calculated for this specific lot.
8. Signatures and Dates:
   • Signature or initials of the compounder who prepared the batch and date of compounding;
   • Signature or initials of the verifying pharmacist who inspected and approved the batch and date of verification.
9. Quality Control Testing Results: Recorded results of pH, weight checks, visual appearance, and sample retention.

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Side-by-Side Comparison: MFR vs. CR

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Chemical Grade Standards and Certificates of Analysis (CoA)

Raw materials used in nonsterile compounding must meet rigorous purity and quality standards. Using industrial or technical grade chemicals introduces unknown impurities, heavy metals, or toxic contaminants.

Hierarchy of Chemical Grades

Compounding personnel must select high-purity chemicals based on the following standard hierarchy:

• USP or NF Grade (Recommended): Meets official United States Pharmacopeia or National Formulary standards. Suitable for pharmaceutical compounding.
• Noncompendial grades: FCC, ACS, analytical, or HPLC labels describe standards for other uses; they do not automatically establish suitability as a drug component. The pharmacist must verify that each bulk drug substance meets the federal 503A conditions, including any applicable USP/NF monograph and FDA-registration requirements.
• Other components: Suitability is established from identity, quality, purity, intended route, supplier documentation, and applicable law—not from a simple grade hierarchy. Technical or industrial materials must not be substituted for pharmaceutical components.

Certificate of Analysis (CoA)

Bulk drug substances and other components are qualified with appropriate supplier documentation, including a lot-specific Certificate of Analysis (CoA) when required. A CoA reports results against the applicable monograph or approved specification; not every component has the same tests.nufacturer. The CoA is a quality document confirming that the specific lot of chemical was analytically tested and meets USP monograph specifications for purity, potency, moisture content, heavy metals, and melting point. Compounding facilities must maintain CoAs on file for all raw chemicals used.

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Compounding Mathematics: Percent Yield & Tolerance Calculations

When required by the MFR or SOP, Percent Yield is recorded in the Compounding Record to detect material-transfer loss, unrecorded additions, or measurement errors. Not every single-unit CNSP uses the same yield-control requirement.

Mathematical Formulas

To calculate percent yield:

$\text{Percent Yield} = \left( \frac{\text{Actual Yield}}{\text{Theoretical Yield}} \right) \times 100\%$
(Note: Written in clean markdown as: Percent Yield = (Actual Yield / Theoretical Yield) * 100%)

Where:

• Theoretical Yield is the target total weight or volume calculated from the MFR.
• Actual Yield is the final net weight or volume measured after compounding and packaging.

Worked Example: Percent Yield Calculation

Scenario: A pharmacy technician follows an MFR to prepare 250 g of Hydrocortisone 1% Topical Cream. After compounding, transferring the cream to jar containers, and weighing the final packaged product, the net weight of the final cream (Actual Yield) is measured at 242.5 g.

Step 1: Identify Given Values

• Theoretical Yield = 250.0 g
• Actual Yield = 242.5 g

Step 2: Apply the Percent Yield Formula Percent Yield = (Actual Yield / Theoretical Yield) * 100%
Percent Yield = (242.5 g / 250.0 g) * 100%
Percent Yield = 0.970 * 100% = 97.0%

Step 3: Evaluate Tolerance Limits Yield acceptance limits must come from the approved MFR and facility SOP; USP <795> does not impose a universal 95%–105% yield window for every CNSP. If this MFR specifies 95.0%–105.0%, the 97.0% result passes that facility criterion. A result outside the documented limit is quarantined and investigated rather than automatically released.

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Record Retention Mandates

All nonsterile compounding documentation—including MFRs, CRs, equipment calibration logs, cleaning records, CoAs, and personnel training files—must be retained for a mandatory retention period:

• Retention period: Keep each record for the period required by the applicable federal and state laws and the facility’s retention policy. Do not infer a universal two-year period from USP <795>.
• Availability: Records may be paper or electronic but must be secure, legible, traceable, and readily retrievable for inspection and a complaint or recall investigation.