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FASTIN vs PHENTERMINE HYDROCHLORIDE

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 19, 2026·How we rate

Rating

70/100
New

Pharmacy pays

~$2.54 /30
~$2.54 /30

Type

RX
RX

Active ingredient

PHENTERMINE HYDROCHLORIDE
PHENTERMINE HYDROCHLORIDE

Dosage forms

Capsule
Capsule, Tablet

Drug class

Sympathomimetic Amine Anorectic
Sympathomimetic Amine Anorectic

Boxed warning

None
None

Treats

Obesity
Obesity

Frequently asked questions

Which is cheaper, Fastin or Phentermine Hydrochloride?

Pharmacies pay about the same to acquire either one — roughly $2.54 for a 30-count supply, per the CMS NADAC survey. That is not what you will be charged: your price is set by your insurer and the pharmacy, not by what the drug cost them.

What is the difference between Fastin and Phentermine Hydrochloride?

Both Fastin and Phentermine Hydrochloride share the active ingredient Phentermine Hydrochloride.

Ratings are based on FDA regulatory (recall-safety) data. This comparison is for general reference only — not medical advice. Always consult a licensed professional before choosing or switching a medication.