FASTIN vs TENUATE DOSPAN

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 23, 2026·How we rate

Possible drug interaction. FASTIN and TENUATE DOSPAN are different prescription medicines. Combining or switching between them can cause interactions — talk to a pharmacist or prescriber before making changes. This page is not medical advice.

Attribute	FASTIN	TENUATE DOSPAN
Rating	70/100	70/100
Pharmacy pays	~$2.58 /30	~$7.96 /30
Type	RX	RX
Active ingredient	PHENTERMINE HYDROCHLORIDE	DIETHYLPROPION HYDROCHLORIDE
Manufacturer	Glaxosmithkline	Ani Pharms
Dosage forms	Capsule	Tablet, extended release
Drug class	Sympathomimetic Amine Anorectic	Sympathomimetic Amine Anorectic
Boxed warning	None	None
Treats	Obesity	Obesity

fastin tenuate dospan

Rating

70/100

Pharmacy pays

~$2.58 /30

~$7.96 /30

Type

Active ingredient

PHENTERMINE HYDROCHLORIDE

DIETHYLPROPION HYDROCHLORIDE

Manufacturer

Glaxosmithkline

Ani Pharms

Dosage forms

Capsule

Tablet, extended release

Drug class

Sympathomimetic Amine Anorectic

Boxed warning

None

Treats

Obesity

Frequently asked questions

Which is better-rated, Fastin or Tenuate Dospan?

Fastin and Tenuate Dospan are tied at 3.5 out of 5 by our independent rating.

Which is cheaper, Fastin or Tenuate Dospan?

Fastin costs pharmacies less to acquire — about $2.58 vs $7.96 for a 30-count supply, per the CMS NADAC survey. That gap is in the pharmacy's cost of goods, not necessarily in what you pay: your price is set afterwards by your insurer and the pharmacy.

What is the difference between Fastin and Tenuate Dospan?

Fastin contains Phentermine Hydrochloride, while Tenuate Dospan contains Diethylpropion Hydrochloride — they have different active ingredients.

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.