What is the next best step for an adult patient with type 2 diabetes and a comorbid condition requiring fluoxetine, who has shown a partial response to glipizide (sulfonylurea) 5 mg Extended Release (ER) daily with a 1-point reduction in Hemoglobin A1C (HbA1C), but still has poor glycemic control with an HbA1C level of 9?

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