Standard Operating Procedure: Non-Sterile Compounding

This Standard Operating Procedure (SOP) establishes the mandatory guidelines for the preparation of non-sterile compounded medications. Adherence to these protocols is essential to ensure product quality, patient safety, and compliance with USP <795> standards. This procedure applies to all pharmacy personnel involved in the compounding process, including verification of ingredients, environmental control, formulation execution, and documentation.

1. Preparation and Workspace Sanitization

• Environmental Control: Ensure the compounding area is clean, uncluttered, and free of non-essential items.
• Surface Disinfection: Sanitize the compounding workspace using 70% Isopropyl Alcohol (IPA) or an approved disinfectant agent. Allow to air dry completely.
• Personal Protective Equipment (PPE): Don appropriate PPE, including a clean lab coat, hair net, face mask, and powder-free gloves. Change gloves immediately if they become compromised or contaminated.
• Documentation Initiation: Verify the master formulation record (MFR) and create a compounding record for the specific batch, ensuring all calculations are double-checked for accuracy.

2. Ingredient Verification and Weighing

• Component Verification: Inspect all raw materials for expiration dates, lot numbers, and physical integrity.
• Calibration Check: Verify that the electronic balance is calibrated using certified weight sets prior to any weighing activity.
• Precision Weighing: Use a clean weigh boat or parchment paper for each ingredient. Tare the scale before each measurement to ensure precision.
• Double-Check System: A second qualified pharmacist or technician must visually verify the ingredient, the weight, and the lot number against the prescription label/MFR.

3. Compounding Execution

• Mixing Technique: Utilize geometric dilution when mixing active pharmaceutical ingredients (APIs) with excipients to ensure uniform distribution.
• Equipment Sanitation: Ensure all mortar and pestle sets, spatulas, and ointment slabs are cleaned and sanitized using validated methods before use.
• Visual Inspection: Observe the final mixture for color uniformity, consistency, and the absence of particulates or air pockets.
• End-Product Assessment: Assess the final product against the expected physical characteristics (e.g., pH, viscosity, color, and odor) as defined in the MFR.

4. Packaging, Labeling, and Documentation

• Container Selection: Select containers that comply with USP requirements for light resistance and material compatibility (e.g., amber glass/plastic).
• Labeling Requirements: Affix a label containing the patient name, medication name, strength, beyond-use date (BUD), storage instructions, and "Compounded Product" auxiliary labels.
• Final Review: The supervising pharmacist must perform a final verification, checking the compounding record, calculations, and the finished product label against the original order.
• Records Retention: Store the signed compounding record in the designated file for a minimum of five years (or per state-specific regulations).

Pro Tips & Pitfalls

• Pro Tip (Geometric Dilution): When mixing a small amount of powder into a large base, always mix the powder with an equal volume of the base, then repeat the process until fully incorporated. This is the single most effective way to prevent "clumping."
• Pro Tip (The "Third Eye"): If you are working alone, take a photograph of your measured ingredients on the scale before mixing. This creates a digital trail for verification purposes.
• Pitfall (BUD Assignment): A common mistake is assigning arbitrary Beyond-Use Dates. Always reference USP <795> default limits or stability-indicating data to avoid drug degradation.
• Pitfall (Cross-Contamination): Never use the same spatula for multiple ingredients without cleaning it first, even if the ingredients seem inert.

Frequently Asked Questions (FAQ)

1. What is the difference between a BUD and an expiration date? An expiration date is determined by a manufacturer based on extensive shelf-life studies. A Beyond-Use Date (BUD) is assigned by the pharmacist at the time of compounding and is based on the specific stability profile of the ingredients and the storage conditions of the final preparation.

2. When is it necessary to re-calibrate the balance? The balance must be calibrated at the start of each shift or compounding session. Furthermore, it should be re-calibrated if the balance is moved or if there is any reason to suspect the accuracy has been compromised.

3. What should I do if I discover a discrepancy during the "Double-Check" phase? Immediately cease the compounding process. Quarantine the ingredients involved, document the discrepancy in the pharmacy’s incident report log, and inform the Pharmacy Manager. Never attempt to "fix" an incorrect mixture; discard it according to hazardous waste or standard disposal protocols and begin the process again with fresh components.