Is the drug Avelox effective if you cut the tablets?

My doctor prescribed Avelox 400mg for 10 days. I have been taking them for 7 days so far, but the only way I can do it and manage the side effects is to cut the pills in 1/4's and take them every half hour with a piece of bread. So I take them at the same time every day, starting with the first 1/4 around 4:30pm and ending with the last 1/4 at 6:30pm. So I get the whole dose ingested over the course of 2 hrs at the same time each day (and I'm able to keep it down without vomiting). I read that the instructions say not to cut or chew the tablets, but I was wondering if what I'm doing is still OK? Any pharmacists or Dr's out there who can answer? I would appreciate it. Thanks.