In clinical trials, Lemtrada slowed multiple sclerosis (MS) disability progression and prevented relapses more effectively than Rebif. But because of Lemtrada’s potential to cause serious side effects, the Food and Drug Administration has restricted its distribution, and only prescribers enrolled in the Lemtrada Risk Evaluation and Mitigation Strategy (REMS) Program can prescribe it.

Lemtrada Facts
  1. Use Treat relapsing forms of multiple sclerosis (MS)
  2. Manufacturer Sanofi Genzyme
  3. Black Box Warning Autoimmunity, infusion reactions, stroke, and malignancies

Lemtrada is a CD52-directed cytolytic monoclonal antibody made by Sanofi Genzyme to treat relapsing forms of multiple sclerosis (MS). The Food and Drug Administration originally approved the drug’s active ingredient, alemtuzumab, under the brand name Campath in 2001 to treat a type of cancer called B-cell chronic lymphocytic leukemia (B-CLL). In 2014, the FDA approved Lemtrada to treat MS.

According to Sanofi Genzyme’s 2018 financial report, more than 60 countries have approved the drug to treat adults with relapsing forms of MS. Worldwide net sales of the medication in 2018 were roughly $450 million.

The FDA has limited the drug’s use in the United States because of known or potential serious risks. These include autoimmune conditions, infusion reactions and increased risk of cancer.

Doctors can only prescribe the medication to patients who have had an inadequate response to two or more MS drugs. To be able to dispense, administer or receive the drug, doctors, hospitals, pharmacies and patients must be enrolled in a restricted distribution program called the Lemtrada Risk Evaluation and Mitigation Strategy (REMS) Program.

Lemtrada REMS Program
Prescribers in the United States must enroll in the Lemtrada Risk Evaluation and Mitigation Strategy (REMS) Program to be able to prescribe the medication.

Common side effects of Lemtrada include rash, infections, body pain, fatigue, insomnia, vomiting and temporary reddening of the skin. The drug’s label includes a black box warning for autoimmunity, infusion reactions, stroke and malignancies.

The FDA required Sanofi Genzyme to add the risk of stroke to the boxed warning in November 2018. The agency warned the drug could also cause tears in the lining of blood vessels in the head and neck. Lawyers are filing Lemtrada lawsuits on behalf of patients who took the drug before the November 2018 warning and suffered strokes, head or neck arterial dissections, and/or death.

Treating Relapsing Forms of Multiple Sclerosis with Alemtuzumab

Doctors don’t know exactly how Lemtrada works to treat relapsing MS. According to Sanofi Genzyme’s website, researchers think the drug affects two types of immune cells: B cells and T cells.

Doctors believe these immune cells are overactive in people with MS. This causes them to attack the protective outer layer around nerve cells called the myelin sheath. Eventually, this damages the nerves. The damaged nerves no longer properly carry signals to the brain or other parts of the body.

Infographic that illustrates how Lemtrada works
Lemtrada recognizes and removes immune cells thought to cause relapsing MS.

Researchers think Lemtrada targets these B cells and T cells and removes them.

About 30 days after treatment, the drug is undetectable in the body, and the immune cell levels begin to increase over time. After about six months, the B cells levels return to normal, but the T cell levels remain lower than they were before treatment. This effect lasts for at least a year.

What to Expect with Lemtrada Infusions

A doctor’s office, clinic or hospital will administer the drug through intravenous infusion. Because of serious risks associated with the drug, patients cannot administer the medication themselves at home.

Before the infusion, the health care provider will give the patient drugs that will prevent or lessen the effects of infusion reactions. These may include corticosteroids, antihistamines and anti-fever medications called antipyretics.

The infusion itself usually takes about four hours but the entire process can take eight hours. Health care providers are required to take baseline lab tests before starting the infusion. During the infusion, health care providers will closely monitor the patient. For at least two hours after infusion, they will continue to watch for signs of infusion reactions.

Patient getting an IV infusion
A Lemtrada infusion takes about four hours in a doctor’s office, clinic or hospital.

Common and Serious Infusion Reactions

The most common Lemtrada infusion reactions include fatigue, shortness of breath, dizziness, pain, upset stomach, nausea, congestion, chills, difficulty sleeping, temporary reddening of the skin, hives and itching.

Serious reactions include life-threatening allergic reactions, blood pressure changes, swelling, irregular heartbeat, fever, headache, wheezing, chest pain and rash.

Patients should tell their health care provider immediately if they experience discomfort or anything unusual during their infusion.

Providers may slow down the infusion or stop it temporarily if there are signs of a reaction. They may also administer additional medication to prevent reactions. In some cases, doctors may stop the infusion completely.

Two Courses of Treatment 12 Months Apart

Lemtrada comes in a single-dose 12 mg/1.2 mL (10 mg/mL) vial for injection. Patients will undergo two or more rounds of treatment.

During the first course of treatment, patients receive one infusion a day for five days in a row. Then, 12 months later, patients receive a second course consisting of one infusion a day for three consecutive days.

Infographic that shows a Lemtrada treatment plan

If necessary, patients may receive subsequent treatment courses of 12 mg per day on three consecutive days at least 12 months after the last dose of any prior treatment course. A health care provider will monitor patients monthly after their first infusion to look for potential side effects. This monthly monitoring will last at least four years after the last round of treatment.

Drug Interactions and Precautions

Researchers have not studied how alemtuzumab reacts with other drugs in people with MS. During clinical trials, patients treated with glatiramer acetate and beta interferon had to stop treatment about a month before starting Lemtrada.

Because health care providers administer the drug intravenously, interaction with food and drink are unlikely.

Lemtrada and Pregnancy
Lemtrada may harm fetuses. Women of childbearing age should use contraception during and for four months after a course of treatment.
Source: Lemtrada prescribing information

Women of childbearing potential should use contraception during and for four months after treatment because the drug may cause harm to an unborn baby. Researchers did not test the drug in patients younger than 17 years old or in enough patients older than 65 years old.

Patients with HIV should not take Lemtrada.

In clinical trials, two MS patients had serious reactions after a single accidental infusion up to 60 mg. There is no antidote for an overdose.

Lemtrada Out-Performed Rebif in Two Clinical Trials

Researchers gathered data in two studies involving 1,191 people. The first was a two-year clinical trial comparing Lemtrada and another MS drug called Rebif. People in this trial had a previous MS relapse while on therapy.

The trial found alemtuzumab cut relapses in half over two years. People who took Lemtrada had 49 percent fewer relapses than people who took Rebif. About 65 percent of people on Lemtrada were relapse-free at two years compared to 47 percent of people on Rebif.

The second study looked at people who had never taken an MS medication. In this study, alemtuzumab cut relapses by 55 percent.

Lemtrada also out-performed Rebif in slowing disability progression. About 87 percent of people taking Lemtrada did not experience confirmed disability progression versus 79 percent of people taking Rebif.

Please seek the advice of a medical professional before making health care decisions.

Related Pages
Michelle Llamas, Senior Content Writer
Written By Michelle Llamas Senior Writer

Michelle Llamas has been writing articles and producing podcasts about drugs, medical devices and the FDA for seven years. She specializes in fluoroquinolone antibiotics and products that affect women’s health such as Essure birth control, transvaginal mesh and talcum powder. Michelle collaborates with experts, including board-certified doctors, patients and advocates, to provide trusted health information to the public. Some of her qualifications include:

  • American Medical Writers Association (AMWA) Engage Committee and Membership Committee member
  • Centers for Disease Control and Prevention (CDC) Health Literacy certificates
  • Original works published or cited in The Lancet, British Journal of Clinical Pharmacology and the Journal for Palliative Medicine
Edited By

8 Cited Research Articles

  1. Sanofi Genzyme. (2018). Form 20-F 2018. Retrieved from https://www.sanofi.com/-/media/Project/One-Sanofi-Web/Websites/Global/Sanofi-COM/Home/common/docs/investors/Sanofi-20-F-2018-EN-PDF-e-accessible_01.pdf?la=en&hash=01DDD931FD5ED27B270AF443C65EA3D2C2768D8B
  2. Sanofi Genzyme. (2019, January 7). Product Monograph Including Patient Information: Lemtrada. Retrieved from http://products.sanofi.ca/en/lemtrada-en.pdf
  3. Sanofi Genzyme. (n.d.). Lemtrada Clinical Study Results, Effect on Relapses. Retrieved from https://www.lemtrada.com/about/clinical-study-relapses
  4. Sanofi Genzyme. (n.d.). Lemtrada in the Body. Retrieved from https://www.lemtrada.com/about/lemtrada-in-the-body
  5. Sanofi Genzyme. (n.d.). The Lemtrada REMS Program to help ensure safe use. Retrieved from https://www.lemtradahcp.com/rems?s_mcid=ps-LP-google-Bgeneral-LEMTRADA
  6. Sanofi Genzyme. (n.d.). What You Need to Know About Lemtrada Treatment and Infusion Reactions: A Patient Guide. Retrieved from https://www.lemtradarems.com/Docs/Pdf/US.MS.LEM.14.10.015-v3_R01_LEMU-HCP_REMS_Infusion_Reacts_PatGuide_Rdr.pdf
  7. U.S. Food and Drug Administration. (2018, November). Prescribing Information. Retrieved from https://www.accessdata.fda.gov/drugsatfda_docs/label/2018/103948s5160_5165lbl.pdf
  8. U.S. Food and Drug Administration. (2018, November 29). FDA warns about rare but serious risks of stroke and blood vessel wall tears with multiple sclerosis drug Lemtrada (alemtuzumab). Retrieved from https://www.fda.gov/drugs/drug-safety-and-availability/fda-warns-about-rare-serious-risks-stroke-and-blood-vessel-wall-tears-multiple-sclerosis-drug
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