Hello doctor, my father is having tremors & stiffness in right hand, & also his neck is pulling backwards 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 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. It will be very helpful.