Metformin for People With CFRD on CFTR Modulator Therapy to Improve Ion Channel Function

Exclusion Criteria

• •1. Prior lung or liver transplant
• •2. Use of supplemental oxygen
• •3. BMI \<18
• •4. CF pulmonary exacerbation requiring hospitalization or intravenous antibiotics in the preceding 30 days
• •5. Systemic corticosteroid or regular non-steroidal anti-inflammatory use in the preceding 30 days
• •6. Cardiac, renal (creatinine clearance \<45 mL/minute), neurologic, psychiatric, endocrine or neoplastic diseases that are judged to interfere with participation in the study
• •7. Alanine aminotransferase, aspartate aminotransferase or alkaline phosphatase \>1.5X the upper limit of normal; bilirubin \>3 mg/dL
• •8. Taking medications that interact with metformin.
• •9. Vitamin B12 deficiency
• •10. Pregnancy or lactation
• •11. Inability or unwillingness to comply with an approved contraceptive method during the study period (females of childbearing age)
• •12. Use of medications known to be strong CYP inducers or moderate to strong CYP inhibitors
• •13. In the opinion of the investigator any severe or acute or chronic condition or laboratory abnormality that may increase the risk associated with trial participation or make the subject inappropriate for enrollment
• •14. Participation in another interventional trial that, in the opinion of the investigator, has the potential to affect the primary outcome