Formulation Development of SYN-004 (ribaxamase) Oral Solid Dosage Form
07. October 2017
SYN-004 (ribaxamase) delayed release drug product is a multi-particulate, hard capsule for oral delivery of a recombinant β-lactamase enzyme designed to degrade β-lactam antibiotics administeredintravenously, and thus prevent colon dysbiosis. Here we describe the development of the SYN-004 enteric coated pellet formulation, which has been tested in multiple clinical trials. Since theSYN-004 drug substance is a buffered liquid, several binder excipients in different ratios were tested to facilitate binding of SYN-004 to sugar spheres. The binding systems were evaluated by dropletpre-evaluation and film casting tests. The most promising formulations were produced in small scale fluidized bed application runs and analyzed by dissolution tests and complementary analyticalassays. Hydroxypropyl cellulose was selected as the preferred SYN-004 binding excipient. The formulation included a second, outer coat containing the enteric EUDRAGIT® L 30 D-55 polymer-based formulation to achievegastric protection, and rapid SYN-004 release in the intestinal tract, when the pH rises above 5.5. Additional formulation improvements resulted in an increase in the SYN-004 load compared to apredecessor oral enzyme formulation (Ipsat P1A). Thus, a novel formulation and process for an orally administered enzyme was developed and used to manufacture drug product for clinical trials.