Robert, a 27-year old man started HIV antiretrovirals three…

Robert, a 27-year old man started HIV antiretrovirals three days ago. He calls your office complaining moderate to severe nausea each morning that starts about 1/2 hours after taking his ARVs and lasts for about two hours. He works in a job that requires full-attention so he wants something with the least amount of potential for somnolence, and does not want any dizziness. An appropriate medication to start for Robert’s nausea is: