I'm not a medical doctor but .... http://www.netdoctor.co.uk/medicines/100002285.html

Risperidone works by blocking the receptors in the brain that dopamine acts on. This prevents the excessive activity of dopamine and helps to control schizophrenia. Risperidone is used by specialists to treat episodes of mania in people with the psychiatric illness, bipolar affective disorder (manic depression).

Hope it works better for you .