Interferon beta-1a has a place with a class of medications known as interferons. These are the normal substances that communicate messages between cells. Interferons are explicitly created by the body and play an important part in the immune system. The Interferon beta 1 dose depends on your medical history and reaction to treatment. To lessen your risk of any side effects, your primary care physician may guide you to begin this treatment at a low dosage and gradually increase it.