Research
Hormonal
Phentermine plus topiramate-extended release (top dose) is the most effective FDA-approved obesity medication for long-term weight loss, producing approximately 9% weight loss relative to placebo at 1 year.
For patients with higher BMI and comorbidities who need significant weight loss, Phentermine/Topiramate (top dose) offers the highest efficacy (~10% loss). However, it requires a strict titration schedule and rigorous contraception for women of childbearing age due to birth defect risks. It is a high-efficacy, high-requirement option.
StrongSupportsHIGH confidence
Obesity medications approved for long-term use, when prescribed with lifestyle interventions, produce additional weight loss relative to placebo ranging from approximately 3% of initial weight for orlistat and lorcaserin to 9% for top-dose (15/92 mg) phentermine plus topiramate–extended release at 1 year.
Why this rating
Based on phase 3 clinical trials (EQUIP, CONQUER) with large sample sizes and intention-to-treat analysis.
Source
Long-term Drug Treatment for Obesity
Susan Z. Yanovski et al. · JAMA · 2013
Meta-analysis · 21 studiesCited 873×
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