ARCALYST vs FLECTOR

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 13, 2026·How we rate

Possible drug interaction. ARCALYST and FLECTOR 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	ARCALYST	FLECTOR
Rating	New	72/100
Pharmacy pays	—	~$146.33 /30
Type	RX	RX
Active ingredient	RILONACEPT	DICLOFENAC EPOLAMINE
Manufacturer	Kiniksa Pharmaceuticals (UK), Ltd.	Ibsa
Dosage forms	Injectable	System
Drug class	—	Nonsteroidal Anti-Inflammatory Drug
Boxed warning	None	Boxed warning
Half-life	—	about 2 hours (terminal/elimination half-life; the label's table gives a mean of 2.3 hours in healthy adults, with wide variation between people — 48% coefficient of variation)
Treats	Inflammation, Inborn Genetic Diseases	Juvenile Arthritis, Rheumatoid Arthritis, Dysmenorrhea

arcalyst flector

Rating

New

72/100

Pharmacy pays

—

~$146.33 /30

Type

Active ingredient

RILONACEPT

DICLOFENAC EPOLAMINE

Manufacturer

Kiniksa Pharmaceuticals (UK), Ltd.

Ibsa

Dosage forms

Injectable

System

Drug class

—

Nonsteroidal Anti-Inflammatory Drug

Boxed warning

None

Boxed warning

Half-life

—

about 2 hours (terminal/elimination half-life; the label's table gives a mean of 2.3 hours in healthy adults, with wide variation between people — 48% coefficient of variation)

Treats

Inflammation, Inborn Genetic Diseases

Juvenile Arthritis, Rheumatoid Arthritis, Dysmenorrhea

Frequently asked questions

What is the difference between Arcalyst and Flector?

Arcalyst contains Rilonacept, while Flector contains Diclofenac Epolamine — 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.