Hello doctor, my father is having tremors & stiffness in right hand, & also his neck is pulling backward continuously from 2 years & he is diagnosed with dystonia & he is taking pacitane 2 mg daily 3 tablets from 2 years to, but from 4 months to he is hearing voices that a group of people are planning to kill him & also he is having suspicion also & he was feeling restlessness, anxious but from 3 months to he is taking olapin 20 mg, zaporil 25 mg (from 20 days), ativan 1 mg, vertin 8 mg, but his condition is improved a little bit now, so please tell me how long we have to continue the medication to cure completely his delusion & auditory hallucinations & what are the side effects it causes, & does these medications cause dementia, please tell me doctor I am worried. & also my is having nasal polyps so he was advised long back to get surgery done by ent doctor so can we do that surgery now, as he is taking antipsychotic drugs, please reply me, doctor, in detail about, how long the medication has to be continued, does it cause dementia, & also suggest for nasal polyps surgery, it will be very helpful.