Based on the definition posted on drugs.com, “Interferon gamma-1b is used to prevent serious infections in people with a condition called chronic granulomatous disease.” Besides, it is also used to hinder the progression of malignant osteopetrosis, which in turn is a disorder that affects bones, blood, and nerves. Interferon gamma-1b, which is actually similar to interferon, a protein produced naturally by our bodies, is thought to work “by affecting cell function/growth and the body's natural defenses (i.e. the immune system) in many ways”, thereby helping our bodies fight off serious infections.(drugs.com). Bear in mind that Interferon gamma-1b comes in the form of a subcutaneous injection that can be taken at home, provided your healthcare provider explains to you how to do it properly. As for the common side effects of these injections, they include diarrhea, fever, headache, and tiredness. Don’t forget to call your doctor as soon as you experience any of the following side effects: seizures, confusion, flu symptoms, or kidney problems. According to drugs.com, Interferon gamma-1b “may affect fertility, whether you are a man or a woman.” It is, however, not known if it harms the fetus. Therefore, you should tell your doctor if you are pregnant before using it.