
503B outsourcing facility: definition, 503A vs 503B, and what FDA cites
A 503B outsourcing facility is a sterile compounder that registers with FDA and follows CGMP. This guide covers section 503B of the FD&C Act, registration, the FY2027 establishment fee and twice-yearly product reporting, a 503A vs 503B comparison, how to vet a 503B pharmacy, and the Atlas Form 483 record for 18 registered outsourcing facilities: 74 forms, 457 observations, the 21 CFR sections cited most, and the record of Leiters Health in Englewood, Colorado.














