Are generic drugs as effective as the brand?

The FDA requires generics to be bioequivalent to the brand — same active ingredient, strength, dosage form, and route of administration — and to meet the same quality standards. Inactive ingredients can differ.

Why is the brand-name version usually more expensive?

The original manufacturer recovers research and marketing costs and holds a patent for a period. Once patents expire, multiple manufacturers can make the generic, and competition lowers the price.

Is there a generic for Epysqli?

Epysqli vs generic Eculizumab-Aagh — independent comparison.

DJMedically reviewed by Dr. Jane Okafor, PharmD, BCPS·Last updated June 7, 2026·How we rate

No generic Eculizumab-Aagh available yet

Epysqli appears to have no listed generic — often because it is still under patent. Browse the same drug class for alternatives.

The brand

Epysqli

by Samsung Bioepis Co Ltd

New

See alternatives in the same drug class →

Brand vs generic: what to know

A generic drug contains the same active ingredient as the brand-name original at the same strength and dosage form. Before approval, the FDA requires it to be bioequivalent — it must work the same way in the body.

Same active ingredient, strength, route, and intended use.
Inactive ingredients (fillers, dyes) may differ — relevant for allergies.
Generics are typically far cheaper once the brand's patent expires.
Appearance (shape, color) often differs and that is normal.

Frequently asked

Is there a generic for Epysqli?: Not in our catalog yet. Epysqli (Eculizumab-Aagh) currently has no listed generic equivalent — often because it is still under patent. See the same drug class for alternatives.
Are generic drugs as effective as the brand?: The FDA requires generics to be bioequivalent to the brand — same active ingredient, strength, dosage form, and route of administration — and to meet the same quality standards. Inactive ingredients can differ.
Why is the brand-name version usually more expensive?: The original manufacturer recovers research and marketing costs and holds a patent for a period. Once patents expire, multiple manufacturers can make the generic, and competition lowers the price.

Information is for general reference only and is not medical advice. Consult a licensed professional before switching between brand and generic.