I've been having palpitations for about a year now. It could be a side effect of risperidone. i've been taking it for 2/3 years and the dose was increased last year. they're mainly at night but sometimes after exercise or just when i'm sitting. my doctor puts it down to anxiety, i have been diagnosed with an anxiety disorder but i wasn't really anxious when it started. in fact it's making my anxiety worse. i can also sometimes feel my pulse in the heel of my left foot.