As for Interferon treatment and
hair loss, yes, many people experience
hair thinning. My
hair became very thinned out over the course of the 48 weeks. I don't know of anything you can 'take' to make it stop, but I used Nioxin shampoo and conditioner, which gave it the appearance of being thicker. It is growing back, though, as thick as it was before.
As for other side effects, the biggest for me was depression and malaise. My doctor prescribed Paxil. It helped.