The treatment for hallucinations depends on the cause. Hallucinations caused by temporary conditions, such as high fever, severe dehydration or infection, will resolve once the underlying condition has been treated. Certain medications and therapies may help treat hallucinations in people with chronic conditions that cause them, including: Typical (first-generation) and atypical (second-generation) antipsychotic medications may help decrease the frequency and severity of hallucinations in people with schizophrenia spectrum disorders, bipolar disorder and major depressive disorder with psychotic features. Repetitive transcranial magnetic stimulation (rTMS) may reduce auditory hallucinations that don’t respond to antipsychotic medications. Acetylcholinesterase inhibitors may reduce psychosis (hallucinations and/or delusions) in people with Alzheimer’s disease, Parkinson’s disease and Lewy body dementia. Acetylcholinesterase inhibitors are a group of drugs that block the normal breakdown of acetylcholine, which is a neurotransmitter that functions in both the peripheral nervous system and central nervous system.