Hi Risperidone is a well known anti-psychotic agent for paranoid schizophrenia that has been in use in the market for several decades. The medicine does have its share of troublesome side effects but headache is not commonly seen in users of risperidone. There is a trend among some psychiatrists to user other alternatives such as olanzapine and aripiprazole. But almost all of the anti-pschotic drugs have these side effects and none is absolutely safe. So one thing is to really confirm if headache is because of risperidone here. Has there been any change in the severity of headche after reducing the dose? Because it should reduce usually if risperidone has been the caustive agent. 1 mg of risperidone is less likely to cause much of the serious side effects seen with risperidone. So if he does not complain of any other symptoms I would suggest to continue the medication if the symptoms of schizophrenia have reduced significantly.