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Data updated: Mar 10, 2026

LEMTRADA

ALEMTUZUMAB CD52-directed Antibody Interactions
Neurology Approved 2001-05-07

Lemtrada (alemtuzumab) is a CD52-directed cytolytic monoclonal antibody indicated for the treatment of relapsing forms of multiple sclerosis in adults. The therapy is approved for both relapsing-remitting disease and active secondary progressive disease. Because of its safety profile, use is typically reserved for patients who have had an inadequate response to two or more other drugs indicated for multiple sclerosis. The medication is not recommended for use in patients with clinically isolated syndrome.

Source: FDA Label • Sanofi • CD52-directed Cytolytic Antibody

How LEMTRADA Works

Alemtuzumab binds to CD52, a cell surface antigen present on T and B lymphocytes, natural killer cells, monocytes, and macrophages. Although the precise therapeutic mechanism is unknown, binding to these lymphocytes results in antibody-dependent cellular cytolysis and complement-mediated lysis. These processes lead to the destruction of the targeted immune cells. This cytolytic action is presumed to be the basis for the drug's effect in treating multiple sclerosis.

Source: FDA Label
4
Indications
--
Phase 3 Trials
2
Priority Reviews
24
Years on Market

Details

Status
Prescription
First Approved
2001-05-07
Routes
INJECTION
Dosage Forms
INJECTABLE

Companies

Active Ingredient: ALEMTUZUMAB

LEMTRADA Approval History

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What LEMTRADA Treats

1 indications

LEMTRADA is approved for 1 conditions since its original approval in 2001. These indications span multiple therapeutic areas including oncology, immunology, and more.

  • Multiple Sclerosis
Source: FDA Label

LEMTRADA Boxed Warning

AUTOIMMUNITY, INFUSION REACTIONS, STROKE, AND MALIGNANCIES LEMTRADA causes serious, sometimes fatal, autoimmune conditions such as immune thrombocytopenia and anti-glomerular basement membrane disease. Monitor complete blood counts with differential, serum creatinine levels, and urinalysis with urine cell counts before starting treatment and then at monthly intervals until 48 months after the last dose of LEMTRADA [see Warnings and Precautions (5.1) ] . LEMTRADA causes serious and life-threateni...

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Trial Timeline

Full development history with FDA approval milestones

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Understanding FDA Approval Types
Count Type What it means
- ORIG Original approval - drug first enters market
- SUPPL - Efficacy New indication (new disease/condition approved)
- SUPPL - Labeling Label text changes (warnings, dosing updates)
- SUPPL - Manufacturing Production changes (new facility)
- SUPPL - Chemistry Formulation changes (new dosage strength)

Green lines in the timeline show ORIG and Efficacy approvals - the clinically meaningful milestones.

LEMTRADA FDA Label Details

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Indications & Usage

FDA Label (PDF)

LEMTRADA is indicated for the treatment of relapsing forms of multiple sclerosis (MS), to include relapsing-remitting disease and active secondary progressive disease, in adults. Because of its safety profile, the use of LEMTRADA should generally be reserved for patients who have had an inadequate response to two or more drugs indicated for the treatment of MS [see Warnings and Precautions ] . LEMTRADA is a CD52-directed cytolytic monoclonal antibody indicated for the treatment of relapsing forms of multiple sclerosis (MS), to include relapsing-remitting disease and active secondary progressiv...

⚠️ BOXED WARNING

WARNING: AUTOIMMUNITY, INFUSION REACTIONS, STROKE, AND MALIGNANCIES LEMTRADA causes serious, sometimes fatal, autoimmune conditions such as immune thrombocytopenia and anti-glomerular basement membrane disease. Monitor complete blood counts with differential, serum creatinine levels, and urinalysis ...

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Data Sources

Data sourced from official FDA and NIH databases. Click links to verify on original sources.