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What is Phentermine?

What is Phentermine, and how does it work?

Phentermine (generic) is a tablet made by Multiple generic manufacturers, whose active ingredient is phentermine. FDA approved as a short-term adjunct — the label says 'a few weeks' — for BMI 30 or more, or 27 with a risk factor such as controlled hypertension, diabetes or hyperlipidemia An amphetamine relative. The label is candid that appetite suppression has not been established as the reason it works. No seller tracked here publishes an all-in monthly price for it.

How it works, from the label

An amphetamine relative. The label is candid that appetite suppression has not been established as the reason it works.

Phentermine is a sympathomimetic amine with pharmacologic activity similar to the prototype drugs of this class used in obesity, amphetamine. Drugs of this class used in obesity are commonly known as anorectics or anorexigenics. It has not been established that the primary action of such drugs in treating obesity is one of appetite suppression since other central nervous system actions, or metabolic effects, may also be involved.

Quoted from the mechanism of action section of FDA prescribing information for phentermine hydrochloride, read 2026-08-29. Not paraphrased: how a drug works is the last thing a price site should put in its own words.

What it costs

Nothing published states an all-in monthly figure, so this site records none.

Phentermine price and terms →The cheapest way to get it →

Phentermine, answered

How does Phentermine work?
An amphetamine relative. The label is candid that appetite suppression has not been established as the reason it works. The label's own words, from its mechanism of action section: "Phentermine is a sympathomimetic amine with pharmacologic activity similar to the prototype drugs of this class used in obesity, amphetamine. Drugs of this class used in obesity are commonly known as anorectics or anorexigenics. It has not been established that the primary action of such drugs in treating obesity is one of appetite suppression since other central nervous system actions, or metabolic effects, may also be involved."
How much does Phentermine cost?
No all-in monthly price is published for Phentermine, so this site records none rather than estimating one.

Everything on Phentermine

Last updated 2026-08-29 — the FDA label this page quotes