Best Practices for 503A Compounding Pharmacies

February 12, 2026

When commercial medications fail to meet the needs of specific patients for a variety of reasons, compounding pharmacies can step in to produce customized medications to meet these individual patients’ specific needs. Because compounded drugs are not FDA-approved, they rely on the pharmacy’s own standard operating procedures (SOPs) and the U.S. Pharmacopeia (USP) standards for safety. This means carefully designed workflows and documentation, ranging from how a script is received to training records and final dispensing logs, to ensure each step is performed correctly with patient safety at the forefront.

Staff Training and Competency

The core of a safe workflow is the staff responsible for carrying it out, making training and ongoing competency assessments essential to safe and effective compounding. All compounding personnel should receive training specific to the type of compounding they perform. Staff involved in sterile compounding must undergo aseptic training and demonstrate competency through hands-on evaluations at regular intervals, and training records should be saved for inspections. Compounding pharmacies can use industry training programs to certify their staff and continuing education, such as those offered by the Professional Compounding Centers of America (PCCA).

Niche Specific Training

Specialized compounding areas require additional expertise, training, and facilities. For example, ophthalmic compounding is a niche that requires highly specialized knowledge of sterile compounding and formulation techniques. Pharmacies offering ophthalmic products should maintain dedicated ISO-certified clean rooms and ensure staff have extra training in sterile processing for sensitive formulations. These additional requirements and the high costs of maintaining USP-compliant facilities have made it challenging for some compounding pharmacies to offer ophthalmic preparations, causing some to reduce or eliminate their compounded ophthalmic formulations.

Quality Assurance and Testing

Robust quality assurance underpins safe compounding, and every compounded product should undergo final checks by a pharmacist. For sterile preparations, this means performing sterility and endotoxin tests, as well as potency testing on samples. Pharmacies can also test the potency of narrow-therapeutic-index drugs before release. For example, VLS Pharmacy subjects all of our ophthalmic drops to a quality-assurance protocol that includes sterility, endotoxin, and potency testing.

Dispensing Compounded Medications

A compounding pharmacy’s responsibilities extend beyond preparing the medication itself and include making sure that compounded drugs are dispensed in appropriate containers, labeled clearly and accurately, and accompanied by thorough patient counseling and education to encourage medication adherence.

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Labeling and Beyond-Use Dating

Clear, complete labeling is a critical safety step, and compounded medications should be labeled with:

Patient’s full name
Prescriber’s name
Pharmacy’s contact information
Drug name (generic active ingredients) and strength
Amount dispensed
Directions for use

Other required label information includes the storage conditions and the beyond-use date (BUD), which is the date after which the medication should not be used. The BUD identifies the time by which the preparation must be used before it is at risk of degradation or contamination and is based on factors like the formulation, containers, and ingredients used.

Patient Counseling

While a properly-labeled compounded preparation will include basic directions for use, patients should not be presumed to understand proper administration without additional guidance. A pharmacist may be the last healthcare professional a patient interacts with before taking their medication, so they play a critical role in patient counseling to ensure the safe use of compounded medications. Pharmacists should offer and document counseling for each new prescription, covering its administration, storage, dosing, and side effects. This is especially true for ophthalmic products where brief written instructions may be insufficient, and pharmacists should actively assess patient understanding and provide a demonstration when needed.

Counseling requirements vary by state, so pharmacies should follow applicable regulations and incorporate them into their standard operating procedures. For mail-order or delivery patients, pharmacists should document efforts to provide counseling by phone and include written materials when direct contact cannot be made. Counseling may also be offered via telephone or in-person visits at the pharmacy, which allow for face-to-face communication that helps build trust and improve patient understanding and confidence in their therapy.

Identity Verification

Pharmacy staff should verify a patient’s identity at pickup or delivery, follow strict procedures for controlled substances, and use secure processes for mailed prescriptions. Consistent training and adherence to the Five Rights of medication use help prevent errors, maintain regulatory compliance, and strengthen patient trust.

Adverse Event Reporting

A strong patient-pharmacy relationship can play an important role in identifying and reporting adverse events. Although the FDA does not mandate adverse event reporting by 503A pharmacies, some states may require it. Regardless of reporting requirements, pharmacies can always voluntarily report adverse events via MedWatch. If a patient does not complete their regimen due to an adverse event or any other reason, they should be instructed on proper disposal of unused medication, such as drug take-back locations.

Choosing VLS Pharmacy & New Drug Loft

By following the best practices outlined in this blog post, VLS Pharmacy & New Drug Loft continues to demonstrate its commitment to patient safety, compounded medication quality and as well as investing in specialized training in several compounding specialties. To keep abreast of USP standards, FDA guidance, and state board of pharmacy requirements, we regularly review and update our procedures and staff competencies. This provides the prescribers we work with with confidence through our transparent processes, established SOPs, and a willingness to engage and answer questions.

Please comment below with any thoughts or questions.

Reach out to our team to learn about best practices and to partner with our experts on custom compounded medications for your patients. All medications from VLS Pharmacy and New Drug Loft are prepared in a lab that follows safety and quality standards per our status as a 503A pharmacy.