Aeterna Zentaris Inc. is a specialty biopharmaceutical company, which is engaged in commercializing and developing therapeutics and diagnostic tests. The Company's lead product, Macrilen (macimorelin), is an oral test indicated for the diagnosis of patients with adult growth hormone deficiency (AGHD). Macrilen (macimorelin) is an orally available peptidomimetic ghrelin receptor agonist that stimulates the secretion of growth hormone by binding to the ghrelin receptor (GHSR-1a) and has uses in both endocrinology and oncology indications. The Company is also leveraging the clinical and compelling safety profile of macimorelin to develop it for the diagnosis of childhood-onset growth hormone deficiency (CGHD). It is also developing oral prophylactic bacterial vaccines against each of SARS-CoV-2, the virus that causes COVID-19, and Chlamydia Trachomatis. The Company focuses on the commercialization of macimorelin in Asia and the rest of the world.