A 58-year-old woman presents to your office with refractory bipolar I disorder. She is on the following medications: lithium carbonate, valproic acid, and olanzapine. She also takes acetaminophen for osteoarthritis and pantoprazole for gastroesophageal reflux. Lately, she has noticed she bruises very easily. Laboratory work displays a platelet count of 70 × 10⁹/L (normal 130–400). Which one of the following is most likely to induce this side effect?
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