Antares Pharma Inc is a specialty pharmaceutical company focused on the development and commercialization of self-administered parenteral pharmaceutical products. Its subcutaneous injection technologies include disposable pressure-assisted auto injectors, reusable needle-free injectors, and disposable multiuse pen injectors. Antares also has partnerships with other pharmaceutical companies to develop and apply drug-delivery systems for their drug compounds. The firm generates the largest proportion of its revenue from sales of Otrexup, subcutaneous methotrexate that can be self-administered with a single-dose, disposable auto injector. Antares also receives revenue from development, licensing, and royalties.