As a friend, I think your first concern should be to be empathetic. It's important that you let your friend know that you are there for him or her in whatever way is most helpful to him or her in this moment. When I was first diagnosed I just wanted things to go back to normal. I had to realize that it was important to share certain safety information with my friends, like my seizure triggers and what to do. So we had a small get together in which we discussed the necessary safety precautions. Thereafter, we didn't talk about the diagnosis much, which felt right to me. In the last year I've been more interested and open about talking about my disease and my friends have been very open and done a great job at sharing information with me. I've appreciated their flexibility, it has allowed me to build and maintain friendships, which are not defined by my diagnosis.