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A healthy 62-year-old female presents to the ED with hypotension. She was seen by a walk-in clinic physician yesterday and was prescribed trimethoprim-sulfamethoxazole for an uncomplicated UTI. She took the antibiotic as prescribed 30 minutes ago. She is complaining of feeling weak and dizzy, with no chest pain, shortness of breath, fever, or GI symptoms. Her vitals are the following: T: 36.7˚C, BP 75/52, HR 98. The patient is given 0.5 mg IM of epinephrine. Five minutes later, she is still hypotensive with a BP 76/58. What is your next step?