A man’s perception of the world turned upside down after he began taking antibiotics to treat bacterial pneumonia, according to a report of his case. Within two days, the 50-year-old man — who had no psychiatric history and had never taken antibiotics in his entire life before that point — experienced mood swings, became irritable and began speaking incoherently. Such behaviors are symptoms of mania, a condition characterized by an abnormally high level of energy and erratic thoughts and behaviors. 

Upon being checked into an emergency psychiatric unit in Geneva, the man told psychiatrists that the night after his first dose of antibiotics, he felt like he was dying and began experiencing auditory hallucinations that God was speaking to him, saying that he had been chosen for a special mission. These symptoms can be indicative of psychosis. 


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