I've been on it since August, 2012. It seems to have caused anxiety and depression for me. At least I wasn't depressed before I started taking it, but I became depressed and much more anxious after starting it. These symptoms became worse after increasing my dose from 0.5 mg to 1 mg per day. They also became worse the longer I was on 1 mg per day.
Two weeks after the increase to 1 mg per day, my doctor switched me from 20 mg of Escitalopram to 20 mg of Fluoxetine. I'm sure that that change didn't help matters, but I still suspect the Risperidone as the main culprit.
In addition to the anxiety and depression, I have the shakes. Usually they're subtle and centered in my belly, but I've had four or five episodes since mid-December where my jaw shakes making my teeth rattle. In some of these episodes the shaking has extended further into my arms and chest. The doctor's I told about it don't seem to worry about it. It seems that they're looking for shaking that mimics Parkinson's Disease.
I also have a lot of sweats and some chills. My sleep pattern has been disrupted. I'm waking around 5 or 5:30 AM almost every day, unable to get out of bed, and just lying there and worrying. I hadn't thought about lethargy, but my motivation is really bad.
The mornings are hellish with anxiety. Some days I get some relief from the anxiety and the depression in the evening. The rest of the time, I barely function as an adult, lots of just sitting and waiting. Sometimes I can rouse myself to walk, but sometimes it's just too rough.
I started reducing my dose Christmas week. Right now I'm back down to 0.5 mg per day. If this week goes okay, I'll drop to 0.4 mg per day on Friday. My most recent doctor seriously recommends a graduated taper with at least a two week interval between drops.
I'm still very depressed and anxious most all of the time. However I did have two good days last week, the first good days I can remember in months. The last three days have been particularly bad, really serious depression, worse than usual which is already pretty bad.