cross contamination with active ingredients is a real concern. The Code of Federal Regulations (CFR) states that "Equipment and utensils shall be cleaned, maintained, and sanitized at appropriate intervals to prevent malfunctions or contamination that would alter the safety, identity, strength, quality, or purity of the drug product beyond the official, or other established requirements" (1). Cleaning validation is required in the pharmaceutical field to avoid potential clinically significant synergistic interactions between armacologically active chemicals (2). Since the issuance of the US Food and Drug Administration's "Guide to Inspection of Validation of Cleaning Process" in July 1993 (3), cleaning validations have received increasing attention.Validation is required not only for manufacturing sites, but also for the sampling- filling suite in research and development.
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