Interferon
This is a protein that is normally produced by the body during viral infections, such as flu. It is given as a cancer treatment to stimulate a person's immune system to attack the myeloma cells. Interferon may be used as a maintenance treatment, to try to keep the myeloma in remission after chemotherapy. It can help to control the disease, but sometimes the side effects can outweigh the benefits.
Interferon is given three times a week, or occasionally daily, as a small injection under the skin (subcutaneously) using a very fine needle. The injections are slightly uncomfortable. You will be taught how to give yourself these injections.
In the first week or two of treatment, interferon can cause symptoms similar to those of flu; especially chills, a high temperature, headache, and aching in the back, joints and muscles. Your doctor may recommend that you take paracetamol, about half an hour before the injection, to prevent these symptoms.
The side effects often disappear within a few weeks of starting treatment, but for some people they continue. Interferon can also make you feel very tired.