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DIETHYLPROPION HYDROCHLORIDE vs PHENTERMINE HYDROCHLORIDE

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 16, 2026·How we rate

Possible drug interaction. DIETHYLPROPION HYDROCHLORIDE and PHENTERMINE HYDROCHLORIDE 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.

Rating

70/100
New

Pharmacy pays

~$7.96 /30
~$2.54 /30

Type

RX
RX

Active ingredient

DIETHYLPROPION HYDROCHLORIDE
PHENTERMINE HYDROCHLORIDE

Dosage forms

Tablet
Capsule, Tablet

Drug class

Sympathomimetic Amine Anorectic
Sympathomimetic Amine Anorectic

Boxed warning

None
None

Treats

Obesity
Obesity

Frequently asked questions

Which is cheaper, Diethylpropion Hydrochloride or Phentermine Hydrochloride?

Phentermine Hydrochloride 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 Diethylpropion Hydrochloride and Phentermine Hydrochloride?

Diethylpropion Hydrochloride contains Diethylpropion Hydrochloride, while Phentermine Hydrochloride contains Phentermine 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.