Aeterna Zentaris Inc., a specialty biopharmaceutical company, engages in developing and commercializing therapeutics and diagnostic tests. Its lead product is macimorelin, a peptidomimetic ghrelin receptor (GHSR-1a) agonist that stimulates the secretion of growth hormone by binding to the GHSR-1a for the diagnosis of adult growth hormone deficiency and childhood-onset growth hormone deficiency, as well as oncology indications. The company markets macimorelin under the Macrilen name. Aeterna Zentaris Inc. has a license agreement with Julius-Maximilians-University Wuerzburg for the development of an oral prophylactic bacterial vaccine against COVID-19 disease; development, manufacture, and commercialization of targeted immunosuppressive therapeutic proteins for the treatment of neuromyelitis optica spectrum disorder. It also has a license agreement with Consilient Health Ltd. and Novo Nordisk Biopharm Limited for the development and commercialization of macimorelin in the United States and Canada, as well as The University of Sheffield, United Kingdom for the research, development, manufacture, and commercialization of parathyroid hormone fusion polypeptides for the treatment of primary hypoparathyroidism. Aeterna Zentaris Inc. was incorporated in 1990 and is headquartered in Summerville, South Carolina.