FASTIN vs TEPANIL TEN-TAB

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 12, 2026·How we rate

Possible drug interaction. FASTIN and TEPANIL TEN-TAB 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	TEPANIL TEN-TAB
Rating	70/100	New
Pharmacy pays	~$2.54 /30	~$7.96 /30
Type	RX	RX
Active ingredient	PHENTERMINE HYDROCHLORIDE	DIETHYLPROPION HYDROCHLORIDE
Manufacturer	Glaxosmithkline	3m
Dosage forms	Capsule	Tablet, extended release
Drug class	Sympathomimetic Amine Anorectic	Sympathomimetic Amine Anorectic
Boxed warning	None	None
Treats	Obesity	Obesity

fastin tepanil ten-tab

Rating

70/100

New

Pharmacy pays

~$2.54 /30

~$7.96 /30

Type

Active ingredient

PHENTERMINE HYDROCHLORIDE

DIETHYLPROPION HYDROCHLORIDE

Manufacturer

Glaxosmithkline

Dosage forms

Capsule

Tablet, extended release

Drug class

Sympathomimetic Amine Anorectic

Boxed warning

None

Treats

Obesity

Frequently asked questions

Which is cheaper, Fastin or Tepanil Ten-Tab?

Fastin costs pharmacies less to acquire — about $2.54 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 Tepanil Ten-Tab?

Fastin contains Phentermine Hydrochloride, while Tepanil Ten-Tab 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.