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A 67-year-old man developed a flare of rheumatoid arthritis while receiving methotrexate, amoxicillin and ciprofloxacin; the reaction was thought to be due to an antibacterial interaction with methotrexate.
The man, who had a history of rheumatoid arthritis, was receiving oral methotrexate 7.5mg weekly. He had been diagnosed with an asymptomatic abdominal aortic aneurysm;...