Geriatric Pharmacotherapy Case Series: GLP-1 RA for Weight Management in Older Adults.

Background

This case study reviews the use of glucagon-like peptide-1 receptor agonists (GLP-1 RA) for weight management in older adults. A 69-year-old male patient discusses weight loss goals with his health care provider and seeks pharmacotherapy options in addition to lifestyle modifications. His medical history includes type 2 diabetes mellitus (T2D), coronary artery disease (CAD), prior coronary artery bypass graft, heart failure with reduced ejection fraction (HFrEF), hypertension, hyperlipidemia, and allergic rhinitis. He initiated weight loss efforts following a myocardial infarction; however, dietary and physical activity changes alone have not resulted in substantial weight reduction. Assessment: This patient is an appropriate candidate for GLP-1 RA therapy given his T2D, obesity, CAD, and a recent elevation in serum creatinine (SCr). The patient will initiate semaglutide, a medication approved for weight management with demonstrated cardiovascular benefit. The dose will be titrated to a maintenance dose of 2 mg once weekly, with ongoing monitoring of tolerability and weight loss.Given his age, there is concern for sarcopenia associated with excessive weight loss. The patient will be advised to maintain a balanced diet with an emphasis on protein intake and to engage in regular physical activity to minimize loss of muscle mass. Outcome: The patient experiences weight reduction within the first few weeks of therapy and tolerates treatment well. He has incorporated additional strength training into his exercise routine and increased his intake of vegetables and protein. The patient has insurance coverage for semaglutide due to his comorbid T2D; therefore, medication cost is not a barrier to treatment.

Conclusion

When evaluating the use of GLP-1 RA agents in older adults, these agents demonstrate benefits beyond glycemic control and weight loss, including cardiovascular and renal outcomes. However, GLP-1 RA-associated weight loss may contribute to muscle loss, which is of particular concern in older adults who are at risk for frailty or falls. Patients receiving GLP-1 RA therapy should be encouraged to maintain adequate protein intake and engage in regular physical activity, particularly resistance training, to preserve muscle mass. Additionally, the high cost of GLP-1 RA agents may limit access for patients without insurance.