What are the age limitations for the use of FDA (Food and Drug Administration)-approved weight loss medications, such as orlistat (Xenical), phentermine-topiramate (Qsymia), liraglutide (Victoza) (liraglutide), and semaglutide (Wegovy) (semaglutide)?

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Last updated: June 13, 2025View editorial policy

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From the Guidelines

FDA-approved weight loss medications have specific age limitations for safe use, with orlistat (Xenical) approved for adults and children aged 12 and older, phentermine-topiramate (Qsymia) approved for adults 18 years and older, liraglutide (Saxenda) approved for adults and children aged 12 and older with a body weight above 60 kg, and semaglutide (Wegovy) approved only for adults 18 years and older. The age limitations for these medications are based on the populations studied in clinical trials and the potential risks and benefits of treatment in different age groups 1.

Age Limitations for FDA-Approved Weight Loss Medications

  • Orlistat (Xenical): approved for adults and children aged 12 and older 1
  • Phentermine-topiramate (Qsymia): approved for adults 18 years and older, with warnings against use during pregnancy due to risk of birth defects 1
  • Liraglutide (Saxenda): approved for adults and children aged 12 and older with a body weight above 60 kg 1
  • Semaglutide (Wegovy): approved only for adults 18 years and older 1

Considerations for Adolescent Patients

For adolescents who qualify for medication use, such as orlistat or liraglutide, treatment should be part of a comprehensive weight management program including diet, physical activity, and behavioral modifications, with close medical supervision to monitor for side effects and ensure appropriate development 1. The long-term effects of these medications on growth and development are not fully understood, and their use in younger populations should be carefully considered.

Clinical Trial Evidence

The clinical trials that led to the approval of these medications primarily studied specific age groups, and the safety and efficacy profiles may differ in younger populations 1. Therefore, it is essential to follow the recommended age limitations for each medication to minimize potential risks and ensure safe and effective treatment.

From the FDA Drug Label

1 INDICATIONS AND USAGE

VICTOZA is indicated: • as an adjunct to diet and exercise to improve glycemic control in adults and pediatric patients aged 10 years and older with type 2 diabetes mellitus, • to reduce the risk of major adverse cardiovascular events (cardiovascular death, non-fatal myocardial infarction, or non-fatal stroke) in adults with type 2 diabetes mellitus and established cardiovascular disease.

The age limitation for the use of liraglutide (Victoza), an FDA-approved weight loss medication, is:

  • 10 years and older for pediatric patients with type 2 diabetes mellitus.
  • Adults with type 2 diabetes mellitus and established cardiovascular disease.

Note: The provided drug labels do not mention the age limitations for orlistat (Xenical), phentermine-topiramate (Qsymia), and semaglutide (Wegovy). Therefore, no conclusion can be drawn for these medications. 2, 2, 2

From the Research

Age Limitations for FDA-Approved Weight Loss Medications

The age limitations for the use of FDA-approved weight loss medications are not explicitly stated in the provided studies. However, the following information can be gathered:

  • The studies primarily focus on adult patients, suggesting that these medications are intended for use in adults [(3,4,5,6)].
  • There is no mention of specific age limitations for the use of orlistat, phentermine-topiramate, liraglutide, or semaglutide in the provided studies.
  • The studies discuss the importance of considering the patient's clinical and biochemical profile, co-morbidities, and drug contra-indications when choosing an anti-obesity medication [(5,6)].
  • The FDA has established guidelines and risk management strategies for the use of these medications, which may include age-related considerations 7.

Key Points to Consider

  • The lack of information on age limitations in the provided studies suggests that the decision to prescribe these medications should be based on individual patient needs and circumstances.
  • Healthcare professionals should consult the FDA-approved labeling and guidelines for each medication to determine the appropriate age range for use.
  • The safety and efficacy of these medications in pediatric or geriatric populations may not be well established, and further research may be needed to determine their use in these age groups [(3,4,5,6)].

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

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