Honestly, I think it's the Copaxone ( in my case, at least) that causes hair loss. I haven't been on Elavil, although I had it prescribed, I never took it. I'm pretty sure Copaxone can cause your hormones to go out of whack. I think it's only mentioned to happen in a small amount of patients, but after reading on several other MS boards and sites, I believe it's more likely to happen than Teva is reporting.