Q. A 66-year-old male with a history of hyperlipidemia and gout presents to his primary care doctor with concerns of recurrent facial redness and warmth that began shortly after he started taking a new medication for his cholesterol levels. He also reports occasional pain in his right big toe. Physical examination is unremarkable, apart from an erythematous, warm facial appearance. Laboratory testing reveals an elevated serum uric acid level and slightly elevated fasting blood glucose. The patient states that he takes his new medication after a meal, as directed, but the facial flushing is quite bothersome. What is the most likely cause of this patient's symptoms?