Phentermine
Bottom line
Phentermine is sold here as Qsymia and Phentermine. Every figure below was read from its own published page on the date shown.
Last updated 2026-08-27 — every published price for this molecule
What is phentermine, and what does it cost?
Phentermine is sold as Qsymia, Phentermine — the same active substance under different approved indications and different dose ceilings, which is why switching between them is a prescribing decision rather than a change of medication. On trial evidence the best published result for this molecule is 8.6% average weight loss, from the trial behind Qsymia; no head-to-head has compared it against another molecule, so that ranks a published result rather than the drug. Its FDA label lists constipation among the common reactions, each with its own page here. A compounded preparation of the same molecule is a different legal product rather than a discount on the approved one: compounding is an exemption from approval, so it carries no trial and no approved label of its own.
Every verified route, cheapest first
Products and sellers together, because the question is what the molecule costs rather than which shelf it sits on.
| Route | A month | What it is | Trial loss | Checked |
|---|---|---|---|---|
| Qsymia | $98 | direct from the maker | 8.6% | 2026-08-27 |
The products phentermine is sold as
1. Qsymia
The strongest non-GLP-1 pill, at about 10% loss — with real pregnancy restrictions.
- A month
- $98
- Trial loss
- 8.6%
- FDA status
- FDA approved for chronic weight management
2. Phentermine
The cheapest weight-loss drug there is — approved for a few weeks, sold by subscription for years.
- A month
- no verified price
- Trial loss
- not published
- FDA status
- 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
What every phentermine label lists, and each on its own page
These reactions appear on the FDA label of Qsymia, Phentermine — the same molecule, so the same list.
Savings programmes across phentermine
- Qsymia Engage
$98 a month — Vivus
Phentermine, answered
- What is the cheapest phentermine?
- Qsymia at $98 a month all-in once titrated, read from its own published page on 2026-08-27. The dearest verified route to the same molecule is Qsymia at $98.
- Which products contain phentermine?
- Qsymia, Phentermine. They differ by approved indication and by dose ceiling rather than by active substance, which is why a switch between them is a prescribing decision rather than a change of medication.
- Is compounded phentermine the same as the branded version?
- Same molecule, different legal product. Compounding is an exemption from FDA approval rather than a form of it, so a compounded preparation has no trial and no approved label of its own, and its quality is a fact about the pharmacy that mixes it. No seller on this site names that pharmacy — all eleven checked, with the pages read listed at /pharmacy.
- How much weight do people lose on phentermine?
- 8.6% on average in the trial behind Qsymia, CONQUER and SEQUEL, phase 3: 6.6% to 8.6% mean weight loss at 56 weeks by dose, with 62–70% of participants losing at least 5% of body weight. That figure describes one trial population under one protocol; no head-to-head trial has compared these molecules against each other, so it ranks published results rather than the drugs.
Every price is read from the seller's own published page on the date shown; anything past 45 days without a re-check is marked stale rather than quietly aging. Label information from FDA prescribing information for QSYMIA. Information only, not medical advice.