Guideline ID: [Z]GPH4-1
Technical Guidelines for Pilot Studies on Traditional Chinese Medicine and Natural Drugs
(Draft 2)
March 18, 002
Technical Guidelines for Pilot Studies of Traditional Chinese Medicine and Natural Drugs
Overview
Pilot-scale studies of Chinese patent medicines and natural drugs refer to the process of scaling up processes under conditions that closely match actual production, following a series of laboratory-based process development studies.
Pilot-scale studies verify and refine laboratory processes to ensure production stability and operability. Samples for quality standards, stability, pharmacology, toxicology, and clinical trials must be produced using the process established during pilot-scale studies. As a foundational and core component of drug development, pilot-scale studies directly impact drug safety, efficacy, and quality control. Therefore, pilot scale, batch size, sample quality, facility, and equipment must comply with relevant requirements.
[Basic Content]
I. Role of Pilot Studies
Samples used for quality standards, pharmacology and toxicology, stability, and clinical studies must be prepared using the process established during pilot-scale studies. Only under stable and feasible process conditions can the reliability of results from pharmacology, toxicology, quality standards, and stability studies be ensured.
Pilot studies help identify issues in process feasibility, labor protection, environmental compliance, and production costs, thereby reducing risks in drug development.
II. Issues Related to Pilot Studies
Pilot-scale facilities must comply with the requirements of Good Manufacturing Practice (GMP). Pilot research equipment should have technical parameters that closely match those of production equipment. Due to differences in drug dosage forms, variations exist in manufacturing processes, equipment, production environment conditions, excipients, and packaging. Therefore, pilot studies must be tailored to the specific dosage form, with particular attention to adapting operations to production characteristics. Key considerations include:
(I) Pilot Study Scale and Batches
Feed quantity, semi-finished product yield, and finished product yield are key indicators for assessing the feasibility and stability of pilot-scale studies. Typically, the feed quantity for a pilot study should be at least 10 times the formulation batch size (calculated based on producing 1000 dosage units) [see 1, 2]. For liquid formulations with fill volumes ≥100 mL, the pilot scale should be appropriately expanded. For products using active ingredients, active fractions, or whole crude drug powders as raw materials, the pilot feed quantity may be reduced, provided that the pilot study objectives are still achieved. Semi-finished and finished product yields should remain stable.
Pilot-scale studies typically require multiple batches to achieve process stability. When submitting for clinical trial approval, at least 1 batches of stable pilot study data must be provided, including batch numbers, starting material quantities, intermediate product amounts, excipient quantities, finished product amounts, and yield rates. These data should also be compared with laboratory study results.
Supplementary applications for changing drug specifications generally do not require pilot study data, except when excipients are changed.
(II) Quality Control of Pilot Studies
During pilot-scale research, evaluate process parameters and associated test data for each critical step, and establish in-house quality standards for intermediates.
Pilot studies must provide content data for the tested ingredients in both the raw materials and pilot samples, along with calculated transfer rates.
References
1, State Food and Drug Administration "Drug Registration Management Measures", 2002, page 11
2, Du Xiaoxi. Technical requirements and analysis of issues in the preparation process of new Chinese medicine drugs. Chinese Journal of Traditional Chinese Medicine. 2001, 26 (12): 802–803.
Author
Research Group on the "Guiding Principles for Pilot Studies of Traditional Chinese Medicines and Natural Drugs"