Drug Usage Statistics, United States, 2008 - 2018

Phentermine Summary for 2018

Estimated number of prescriptions in the United States 3,683,239
Top drug rank #168 ( 42)
Average total drug cost $24.04 (USD)
Average out-of-pocket cost $21.86 (USD)

Number of Prescriptions Over Time (2008 - 2018)

Rank of Top Drugs Over Time

"Rank" refers to the frequency that a given medication is prescribed within a calendar year compared to all other medications. A rank of "4" would indicate that the medication was the fourth most commonly prescribed medication.

Year Rank Change
2008 289  29
2009 244  45
2010 242  2
2011 245  3
2012 270  25
2013 265  5
Year Rank Change
2014 170  95
2015 195  25
2016 226  31
2017 210  16
2018 168  42

Drug Cost Over Time (2008 - 2018)

  • Total cost: The average total cost of the medication including the out-of-pocket cost (see below) plus the amount paid by other parties (Medicare, Medicaid, private insurance, Veterans Administration, TRICARE, other state/federal sources, Worker's compensation, and other miscellaneous sources)
  • Out-of-pocket cost: The average payment made by the patient which may include deductibles, coinsurance, copayments, or the cash price paid without insurance coverage.

Related Drugs

Drug Name Total Prescriptions (2018)
Phentermine (this drug) 3,683,239

Drug Synonyms

Drug synonyms are used during the sanitation and standardization process of "cleaning" the original data source (MEPS). Occassionally, brand names may be listed below that are no longer on the market or are very infrequently used.

Brand Name Synonyms
  • Adipex-p
  • Fastin
  • Lomaira
  • Obestin-30
  • Oby-trim
  • Ona-mast
  • Suprenza
  • Tora
  • Wilpo
Generic Drug Synonyms and Salts
  • Phentermine Hydrochloride
  • Phentermine

FDA Approval Information

Established Pharmacologic Class (EPC): Sympathomimetic Amine Anorectic
Initial FDA approval date: Prior to January 1, 1982
First FDA applicant: Discn
First dosage form: Capsule (oral)

Prescription data source: Medical Expenditure Panel Survey (MEPS) 2008-2018. Agency for Healthcare Research and Quality (AHRQ), Rockville, MD. ClinCalc DrugStats Database version 21.1. Read more about the ClinCalc DrugStats database.

All ClinCalc DrugStats figures and graphs on this page are licensed under Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0).


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Updated Jan 18, 2021
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