Regulatory

GMP Compliance in Tablet Coating: A Practical Guide for Pharma Manufacturers

Published in 2025 | ANSHCOAT Knowledge Hub

GMP Compliance in Tablet Coating: A Practical Guide for Pharma Manufacturers

In the pharmaceutical industry, film coating is not merely an aesthetic process; it is a critical manufacturing step that directly impacts drug safety, efficacy, and stability. Therefore, the coating process is heavily scrutinized by regulatory bodies like the FDA and EMA. Maintaining strict Good Manufacturing Practice (GMP) compliance is essential to avoid audit findings and batch recalls.

Here is a practical, step-by-step overview of GMP requirements for pharmaceutical tablet coating.

1. Raw Material Qualification & Vendor Audits

GMP compliance begins long before the polymer enters the coating pan. Every excipient used in your formulation—including polymers, plasticizers, and pigments—must be rigorously qualified. Manufacturers must ensure that their excipient suppliers operate under certified Quality Management Systems (QMS). Regular vendor audits should be conducted to verify that the raw materials are free from contamination, consistent from batch to batch, and fully compliant with current pharmacopeial standards (USP/EP/JP).

2. Facility and Equipment Validation

Your coating facility must be designed to prevent cross-contamination. This involves maintaining proper HVAC systems to control particulate matter and humidity. Furthermore, coating equipment (pans, spray guns, and peristaltic pumps) must undergo strict Installation Qualification (IQ), Operational Qualification (OQ), and Performance Qualification (PQ). Calibration of temperature probes and airflow meters is mandatory to ensure thermodynamic process parameters are accurately recorded.

3. In-Process Quality Control (IPQC)

Coating is a dynamic thermodynamic process. Under GMP guidelines, manufacturers must establish and monitor critical process parameters (CPPs) such as inlet/exhaust temperatures, atomization air pressure, pan speed, and spray rate.

During the coating run, QA teams must conduct routine In-Process Quality Checks (IPQC). This includes monitoring tablet weight gain, testing for film adhesion, checking for physical defects (like twinning or edge chipping), and verifying moisture content. Any deviation from the validated parameters must be thoroughly investigated.

4. Batch Documentation and Traceability

The core principle of GMP is: "If it is not documented, it did not happen." Every step of the coating process must be recorded in the Electronic Batch Manufacturing Record (EBMR). This includes the precise weighing of excipients, equipment cleaning logs, environmental monitoring data, and the signatures of the operators performing the tasks. Complete traceability ensures that in the event of an issue, the root cause can be accurately identified.

Partnering for Compliance

Navigating regulatory standards requires reliable partners. ANSHCOAT supports your compliance efforts by providing highly consistent, regulatory-approved coating systems backed by comprehensive technical documentation, easing your burden during regulatory audits.