Avonex® is a multiple sclerosis medication available by prescription. It is thought that the drug works by preventing the immune system from attacking and destroying the protective coating around nerve fibers. Since Avonex would be digested and inactivated by the digestive system if taken by mouth, it must be injected into a muscle once weekly. Potential side effects of Avonex include headache, weakness, and fever.
(Click Avonex for more information about how Avonex can help limit an immune system response, tips on how and when to inject the medication, and a more detailed list of potential side effects to look out for during treatment.)