follow the link
http://www.medhelp.org/posts/Hepatitis-C/Anal-Issues-Bowel-Movements/show/1629482
also here is this
pooh55811
Jan 06, 2012 .To: garelli.I was on Incivek for 12 weeks. I have been off of it for 2 1/2 weeks. I had the rectal problems with Incivek. After feeling like I was crapping hot shards of glass, I finaly figured out that the solution is to keep the stools firm, not like a rock, but pretty firm. The minute they get soft or loose, or heaven forbid, diarrhea, they start to burn and truly feel like shards of glass. It took me too tries to figure this out (two episodes of the shards of glass) but I did figure out what worked. TYhe third time it started I nipped it in the bud and cleared up the problem quickly.
To keep the stools firm I took loperimide tabs at the first sign of soft stools. As long as I got it before it got soft, I was fine. I don't know about the fiber. I read some place (but have no idea where) that commercial fiber binds with the pills so I never took any of the drugstore fiber.
Also, use Huggies (with aloe) baby wipes and use them every s single time you go. Keep the rectal area exceptionally clean.The generic brands burn, so I stuck with Huggies.
I also used Prep H suppositories and Prep. H cream. They worked.
Hope this helps because the rectal issues, if they are bad enough, could be a big problem. .