Excessive secretion of dopamine leads to excessive immersion in useless things such as obsessive compulsive disorder, schizophrenia, and delusions of grandeur. If you don't do anything, you clean the whole house with a toothbrush, count all the letters in the book, or grind your teeth to the point where you can't cure your gums and teeth.Thus, antipsychotics such as risperidone block these dopamine receptors to help them live normal lives.