An 80-year-old male with a history of Alzheimer’s disease and Parkinson’s disease is admitted to the hospital for nausea and vomiting due to a recent gastrointestinal infection. His caregiver reports worsening confusion and increased difficulty with movement over the past day. His current medications include carbidopa-levodopa and donepezil. A review of his chart shows that he was recently prescribed a new anti-nausea medication. Question: Which of the following anti-nausea medications is most likely responsible for this patient’s worsening symptoms?
