A 27 year old man with a diagnosis of atypical depression goes to a Mexican restaurant and consumes a meal rich in avocados and cheese. Following the meal he has a few glasses of wine with some friends over dessert. A few hours later he begins to feel uneasy. He starts to feel very nauseated and begins vomiting continuously. At the ED his vitals are BP 200/100; P 120; RR 23; Temp 102. What medication was he likely taking for his atypical depression?