(-)-Fenchone is a bicyclic monoterpenoid widely distributed in plants and can be extracted from Foeniculum vulgare and Peumus boldus.

Histrelin acetate is a nonapeptide analog of gonadotropin-releasing hormone (GnRH) with added potency. It acts on particular cells of the pituitary gland called gonadotropes when present in the bloodstream. Histrelin stimulates these cells to release luteinizing hormone and follicle-stimulating hormone. Thus it is considered a gonadotropin-releasing hormone agonist or GnRH agonist.

Lactose is a disaccharide sugar derived from galactose and glucose that is found in milk.