Synthetic Biologics, Inc. is a clinical-stage company. The Company is engaged in developing therapeutics to protect the gut microbiome while targeting pathogen-specific diseases. The Company's lead product candidates in Phase II development are SYN-010, which is intended to reduce the impact of methane-producing organisms in the gut microbiome to treat an underlying cause of irritable bowel syndrome with constipation (IBS-C), and SYN-004, which is designed to protect the gut microbiome (gastrointestinal (GI) microflora) from the effects of certain commonly used intravenous (IV) antibiotics for the prevention of C. difficile infection (CDI) and antibiotic-associated diarrhea (AAD). Its other product candidates include SYN-007, SYN-006, SYN-005, SYN-200 and SYN-020. The Company is also developing preclinical-stage monoclonal antibody therapies for the prevention and treatment of pertussis, and discovery-stage biotherapeutics for the treatment of phenylketonuria (PKU).