I've studied on Humira a lot since I've been on it for quite a while. I even talked to my doctor wondering why he's having me take 2 shots instead of 1, I looked on the humira site under the Crohn's part since there isn't a UC part, and it states that the first injection is 4 shots, then 2 weeks later it's 2 shots, then it goes down to 1 shot every 2 weeks. So, I asked my doctor about that. He said that with all the flaring I've had, the dosage he's having me take is the proper dosage to keep me in remission. I guess there is another, more advanced information that he has that isn't given for us. Eventually he's bringing me down to 1 shot every 2 weeks though. With the taking effect, I think it took me about 2 or 3 months for it to actually put me in total remission. Before I started Humira, I was kinda in remission, but kinda not.
Here is the site if u want to look for the information yourself.
Diagnosed with UC since March 2007
Taking Humira and Imuran since May 2007 (Currently in remission since May 2007)