Pharmacy Compounding Accreditation Board (PCAB). As the demand for compounding has increased, and to provide standards in procedures, documentation, quality and training, PCAB has emerged as the most comprehensive compliance solution in the industry with standards based on U.S. Pharmacopeial Convention (USP) guidelines. PCAB accreditation, in combination with the pharmacy’s commitment to continuous compliance, significantly reduces the risk associated with compounding medications and demonstrates a commitment to meeting the highest industry standards for quality and safety.