ONA-MAST vs X-TROZINE

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated June 7, 2026·How we rate

Possible drug interaction. ONA-MAST and X-TROZINE 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	ONA-MAST	X-TROZINE
Rating	New	New
Pharmacy pays	~$2.54 /30	~$3.86 /30
Type	RX	RX
Active ingredient	PHENTERMINE HYDROCHLORIDE	PHENDIMETRAZINE TARTRATE
Manufacturer	Mast Mm	Shire Richwood
Dosage forms	Capsule, Tablet	Tablet
Drug class	Sympathomimetic Amine Anorectic	Sympathomimetic Amine Anorectic
Boxed warning	None	None
Treats	Obesity	Obesity

ona-mast x-trozine

Rating

New

Pharmacy pays

~$2.54 /30

~$3.86 /30

Type

Active ingredient

PHENTERMINE HYDROCHLORIDE

PHENDIMETRAZINE TARTRATE

Manufacturer

Mast Mm

Shire Richwood

Dosage forms

Capsule, Tablet

Tablet

Drug class

Sympathomimetic Amine Anorectic

Boxed warning

None

Treats

Obesity

Frequently asked questions

Which is cheaper, Ona-Mast or X-Trozine?

Ona-Mast costs pharmacies less to acquire — about $2.54 vs $3.86 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 Ona-Mast and X-Trozine?

Ona-Mast contains Phentermine Hydrochloride, while X-Trozine contains Phendimetrazine Tartrate — 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.