Phentermine is a stimulant medication used for short-term weight loss [1]. It works by affecting the central nervous system, reducing appetite [2]. It is typically prescribed in combination with diet and exercise for individuals with a body mass index (BMI) of 30 or higher, or 27 or higher if they have certain risk factors [1].
How long has phentermine been available generically?
Phentermine has been available as a generic medication for a significant period. Its development dates back to the 1950s, and it became widely available in generic forms over time [3].
What are the different forms of generic phentermine?
Generic phentermine is available in several forms, most commonly as oral capsules and tablets [4]. Extended-release formulations are also available under various brand names and their generic equivalents [4].
How does generic phentermine work?
Phentermine is a sympathomimetic amine, similar in structure to amphetamines [2]. It stimulates the release of neurotransmitters like norepinephrine, which suppresses appetite by affecting the brain's hunger control center [5].
What is the typical dosage for generic phentermine?
Dosages can vary, but common recommendations include 8 mg, 15 mg, 30 mg, or 37.5 mg taken once daily [1]. Extended-release versions are also available in different strengths [4].
Who makes generic phentermine?
Multiple pharmaceutical manufacturers produce generic phentermine. The availability of generic versions means that various companies can produce and market the drug, leading to competition [6].
When does phentermine's patent protection expire?
As phentermine has been available for decades, its original patents have long expired. DrugPatentWatch.com tracks patent expirations for many medications, and for older drugs like phentermine, the primary patents that would have granted market exclusivity have lapsed [7]. This allows for generic production.
What are the side effects of generic phentermine?
Common side effects include dry mouth, restlessness, insomnia, constipation, and changes in taste [1]. More serious side effects can involve increased heart rate, elevated blood pressure, and, in rare cases, pulmonary hypertension or heart valve issues [1][8].
Can generic phentermine be taken long-term?
Phentermine is generally approved for short-term use, typically up to 12 weeks [1]. Long-term safety and efficacy data are limited, and extended use is usually monitored closely by a healthcare provider [1][9].
How does generic phentermine compare to other weight loss medications?
Phentermine is often prescribed for its immediate appetite-suppressing effects. Other weight loss medications may work through different mechanisms, such as affecting fat absorption or increasing feelings of fullness, and have different approval timelines and potential side effect profiles [10].
What are the risks of taking generic phentermine?
Risks are associated with its stimulant properties, including cardiovascular effects like increased blood pressure and heart rate [1][8]. It can also be habit-forming, and there is a potential for abuse [1]. Individuals with certain pre-existing conditions, such as heart disease or high blood pressure, may not be suitable candidates for phentermine [1].
What are the alternatives to generic phentermine for weight loss?
Alternatives include lifestyle modifications such as dietary changes and increased physical activity, as well as other prescription weight loss medications with different mechanisms of action [10]. Discussing these options with a healthcare professional is recommended.
How much does generic phentermine cost?
The cost of generic phentermine can vary widely depending on the pharmacy, dosage, and insurance coverage [11]. Because it is a generic drug, it is generally less expensive than its brand-name counterparts [6].
**Sources:
[1] National Library of Medicine. (2023). Phentermine. MedlinePlus. https://medlineplus.gov/druginfo/meds/a682139.html
[2] U.S. Food & Drug Administration. (2018). FDA approves new weight-loss drug. https://www.fda.gov/news-events/press-announcements/fda-approves-new-weight-loss-drug
[3] Weintraub, M. (1994). long-term weight control. Archives of Internal Medicine, 154(14), 1622-1624.
[4] DailyMed. (n.d.). Phentermine Hydrochloride. Retrieved from https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=f1d97888-74c6-4b49-b359-8f790b3b0018
[5] Bray, G. A., & Ryan, D. H. (2015). Pharmacotherapy of the obese patient. *Endocrinology and Metabolism Clinics, 44(2), 247-262.
[6] U.S. Food & Drug Administration. (n.d.). Generic Drugs. https://www.fda.gov/drugs/generic-drugs
[7] DrugPatentWatch.com. (n.d.). Retrieved from https://drugpatentwatch.com/
[8] Ayyad, O., & Abraham, J. (2018). Drug-induced valvular heart disease. Current Cardiology Reports, 20(10), 97.
[9] National Institutes of Health. (n.d.). Phentermine and Topiramate. NIH. https://www.niddk.nih.gov/health-information/weight-management/adult-weight-loss-medications/phentermine-topiramate
[10] U.S. Food & Drug Administration. (n.d.). Weight Loss and Your Health. https://www.fda.gov/consumers/consumer-updates/weight-loss-and-your-health
[11] GoodRx. (n.d.). Phentermine Prices, Coupons, and Patient Assistance Programs. Retrieved from https://www.goodrx.com/phentermine