Phentermine increases heart rate, blood pressure, and metabolic rate as side effects of its mechanism
However, the drug was subsequently overtaken by Pfizers Lipitor (FDA-approved in 1996), which generated ~$100B in sales from 1992 to 2017
Source: Barrett, et al JAMA Surgery, September 17, 2025 Researchers correlated insurance claims data and electronic medical records in a system that owns both an insurance plan (Highmark) and a provider system (Allegheny Health), and compared total medical expense for over 30,000 individuals who had either metabolic and bariatric surgery (sleeve gastrectomy) or were treated with GLP-1 medications between 2018 and 2023
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This flexibility provides manufacturers with practical options depending on their storage capabilities and usage timelines