LEMTRADA is a prescription medicine used to treat adults with relapsing forms of multiple sclerosis (MS). Because of its risks, LEMTRADA is generally used in people who have tried 2 or more MS medicines that have not worked well enough. It is not known if LEMTRADA is safe and effective for use in children under 17 years of age.


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Lemtrada Safety

A look at some of the potential side effects

When considering LEMTRADA as your relapsing MS medicine, it's important to discuss potential common and serious side effects with your healthcare provider.

LEMTRADA can cause serious side effects including autoimmune problems, infusion reactions, stroke, tears in your arteries that supply blood to your brain (carotid and vertebral arteries), some kinds of cancers, thyroid problems, low blood counts (cytopenias), inflammation of the liver, serious infections, inflammation of the gallbladder without gallstones (acalculous cholecystitis), and swelling of lung tissue (pneumonitis). Because of the risks of autoimmune problems, infusion reactions and some kinds of cancers, LEMTRADA is only available through a restricted program called the Risk Evaluation and Mitigation Strategy (REMS) Program.

In two 2-year clinical trials, LEMTRADA was studied in over 800 patients.

These are the common side effects experienced by LEMTRADA patients during the clinical trials:

  • rash
  • headache
  • thyroid problems
  • fever
  • swelling of your nose and throat
  • nausea
  • urinary tract infection
  • feeling tired
  • trouble sleeping
  • upper respiratory infection
  • herpes viral infection
  • hives
  • itching
  • fungal infection
  • joint pain
  • pain in your arms or legs
  • back pain
  • diarrhea
  • sinus infection
  • mouth pain or sore throat
  • tingling sensation
  • dizziness
  • stomach pain
  • sudden redness in face, neck, or chest
  • vomiting
Discussing relapsing MS treatment
“ Everybody's relapsing MS and
treatment plan is different.

And everybody
reacts differently
to medications.

– Ryan

What patients are saying

Discussion Guide

Take this guide to your next appointment to help start the conversation about treatment with LEMTRADA.

Get The Guide