FASTIN vs WEGOVY

Independent side-by-side comparison.

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

Possible drug interaction. FASTIN and WEGOVY 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	WEGOVY
Rating	70/100	70/100
Pharmacy pays	~$2.58 /30	—
Type	RX	RX
Active ingredient	PHENTERMINE HYDROCHLORIDE	SEMAGLUTIDE
Manufacturer	Glaxosmithkline	Novo Nordisk
Dosage forms	Capsule	Injectable, Tablet
Drug class	Sympathomimetic Amine Anorectic	Glp-1 Receptor Agonist
Boxed warning	None	Boxed warning
Half-life	—	about 1 week (roughly 7 days)
Treats	Obesity	Obesity, Overweight

fastin wegovy

Rating

70/100

Pharmacy pays

~$2.58 /30

—

Type

Active ingredient

PHENTERMINE HYDROCHLORIDE

SEMAGLUTIDE

Manufacturer

Glaxosmithkline

Novo Nordisk

Dosage forms

Capsule

Injectable, Tablet

Drug class

Sympathomimetic Amine Anorectic

Glp-1 Receptor Agonist

Boxed warning

None

Boxed warning

Half-life

—

about 1 week (roughly 7 days)

Treats

Obesity

Obesity, Overweight

Frequently asked questions

Which is better-rated, Fastin or Wegovy?

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

What is the difference between Fastin and Wegovy?

Fastin contains Phentermine Hydrochloride, while Wegovy contains Semaglutide — 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.