Review Question - QID 213361

A 64-year-old woman presents to the emergency department with a 1-hour history of shortness of breath and chest pain. She said that the symptoms came on suddenly and that the chest pain is worse when she tries to take a deep breath. Her past medical history is significant for a previous deep venous thrombosis for which she was taking a blood thinner. She also has diabetes, hypertension, hyperlipidemia, and partial seizures which are treated with metformin, lisinopril, atorvastatin, and carbamazepine and valproic acid, respectively. Which of these drugs is most likely responsible for causing this patient's blood thinner medications to fail?