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Campath (Intravenous)

Generic name: alemtuzumabal-em-TOOZ-oo-mab ]
Brand names: Campath, Lemtrada
Drug class: CD52 monoclonal antibodies

Medically reviewed by Last updated on Jul 31, 2023.

Intravenous route(Solution)

Cytopenias, Infusion-related Reactions, and Infections

Serious, including fatal, cytopenias, infusion-related reactions, and infections can occur.

Limit doses to 30 mg (single) and 90 mg (cumulative weekly); higher doses increase risk of pancytopenia.

Escalate dose gradually and monitor patients during infusion. Withhold therapy for Grade 3 or 4 infusion-related reactions.

Administer prophylaxis against Pneumocystis jirovecii pneumonia (PCP) and herpes virus infections .

Intravenous route(Solution)

Autoimmunity, Infusion Reactions, Stroke, and Malignancies

Alemtuzumab 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 does of alemtuzumab.

Alemtuzumab causes serious and life-threatening infusion reactions. Alemtuzumab must be administered in a setting with appropriate equipment and personnel to manage anaphylaxis or serious infusion reactions. Monitor patients for two hours after each infusion. Make patients aware that serious infusion reactions can also occur after the 2-hour monitoring period.

Serious and life-threatening stroke (including ischemic and hemorrhagic stroke) has been reported within 3 days of alemtuzumab administration. Instruct patients to seek immediate medical attention if symptoms of stroke occur.

Alemtuzumab may cause an increased risk of malignancies, including thyroid cancer, melanoma, and lymphoproliferative disorders. Perform baseline and yearly skin exams.

Because of the risk of autoimmunity, infusion reactions, and malignancies, alemtuzumab is available only through restricted distribution under a Risk Evaluation Mitigation Strategy (REMS) Program. Call 1-855-676-6326 to enroll in the alemtuzumab REMS program .

Uses for Campath

Alemtuzumab injection is used to treat the relapsing forms of multiple sclerosis (MS), including relapsing-remitting disease and active secondary progressive disease. This medicine will not cure MS, but it may slow some of the disabling effects and decrease the number of relapses of the disease. It should only be used when 2 or more other medicines to treat MS did not work well.

This medicine is available only under a restricted distribution program called the Lemtrada® REMS (Risk Evaluation and Mitigation Strategy) Program.

Before using Campath

In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For this medicine, the following should be considered:


Tell your doctor if you have ever had any unusual or allergic reaction to this medicine or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.


Appropriate studies have not been performed on the relationship of age to the effects of alemtuzumab injection in children younger than 17 years of age. Use is not recommended in children. Safety and efficacy have not been established.


Appropriate studies on the relationship of age to the effects of alemtuzumab injection have not been performed in the geriatric population. However, geriatric-specific problems that would limit the usefulness of alemtuzumab injection in the elderly are not expected.

Breast Feeding

There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.

Interactions with Medicines

Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are receiving this medicine, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.

Using this medicine with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.

Using this medicine with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.

Interactions with Food/Tobacco/Alcohol

Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.

Other Medical Problems

The presence of other medical problems may affect the use of this medicine. Make sure you tell your doctor if you have any other medical problems, especially:

Proper use of Campath

A nurse or other trained health professional will give you this medicine in a medical facility. It is given through a needle placed into one of your veins.

This medicine is usually given for 2 treatment courses. You will receive this medicine for 5 consecutive days for the first treatment course and for 3 consecutive days about 12 months later for your second treatment course. Each treatment usually takes about 4 hours per day.

Your doctor may ask you to stay for at least 2 hours after each treatment to check for unwanted effects.

You will receive steroid medicines right before starting treatment to prevent allergic reactions and for the first 3 days of each treatment course. You will also be given antiviral medicines starting on the first day of each treatment course and for at least 2 months after treatment. These medicines are given to prevent infections caused by the herpes virus.

It is very important that you understand the requirements of the Lemtrada® REMS program, and become familiar with the Lemtrada® Medication Guide. Read and follow these instructions carefully. Ask your doctor if you have any questions.

Precautions while using Campath

It is very important that your doctor check your progress closely and at regular visits to make sure this medicine is working properly. Blood and urine tests may be needed to check for any unwanted effects during treatment and for 48 months after your last dose. If you have signs or symptoms of an autoimmune disease, your doctor may continue to check your progress after 48 months. It is also important that your doctor check your skin for melanoma (tumor) yearly. Be sure to keep all appointments.

Do not use this medicine if you are also receiving or have received Campath®.

Receiving this medicine while you are pregnant can harm your unborn baby. Use an effective form of birth control to prevent from getting pregnant while you are receiving this medicine and for at least 4 months after the last dose. If you think you have become pregnant while receiving this medicine, tell your doctor right away.

This medicine may cause serious infusion reactions, which can be life-threatening and require immediate medical attention. Tell your doctor right away if you start to have a cough, difficulty with swallowing, dizziness, fast heartbeat, trouble breathing, chest tightness, swelling in your face or hands, fever, chills, itching or hives, or lightheadedness or faintness while you are receiving this medicine.

This medicine may increase your risk of having a stroke (eg, ischemic and hemorrhagic stroke) and tears in your arteries that supply blood to your brain (carotid and vertebral arteries). Check with your doctor right away if you have parts of your face that are drooping, weakness on one side of your body, sudden, severe headache, difficulty with speech, or neck pain.

This medicine may increase your risk of cancer, including thyroid, skin, or lymph node cancer. Call your doctor right away if you have a new lump or swelling in the neck, cough, hoarseness or voice changes, neck pain, or trouble with breathing or swallowing.

This medicine may cause autoimmune disorders, including immune thrombocytopenia (ITP), hepatitis (swelling of the liver), or encephalitis (swelling of the brain). Tell your doctor right away if you have confusion, irritability, headache, seizures, stiff neck, unusual nausea, vomiting, stomach pain, tiredness, loss of appetite, or yellow eyes or skin, dark urine, a bloody nose, coughing or spitting up blood, small red or purple spots on skin, or heavier than normal or irregular monthly periods.

This medicine may cause a serious kidney problem called anti-glomerular basement membrane disease. Call your doctor right away if you have blood in the urine, coughing up blood, or swelling in your legs or feet.

Alemtuzumab may cause hemophagocytic lymphohistiocytosis, a severe inflammatory condition which can be life-threatening, which is caused by an overactive immune system. The symptoms of this disease may occur within 13 to 33 months after starting treatment with this medicine. Check with your doctor right away if you have a fever, right upper abdominal or stomach pain and fullness, rash, swollen, painful, or tender lymph glands in the neck, armpit, or groin, mental status changes, shakiness and unsteady walk, unsteadiness, trembling, or other problems with muscle control or coordination, or seizures.

This medicine may cause Adult onset Still's disease (AOSD), a rare inflammatory condition which can be life-threatening. Call your doctor right away if you have a high fever lasting more than 1 week, pain, stiffness with or without swelling in multiple joints, or skin rash.

This medicine may cause thrombotic thrombocytopenic purpura, which can be life-threatening. Check with your doctor right away if you have black, tarry stools, blood in the urine, bloody nose, fever, heavier menstrual periods, pinpoint red spots on the skin, skin rash, unusual bleeding or bruising or unusual tiredness or weakness.

This medicine may increase your risk for serious bleeding problems, including acquired hemophilia A. Check with your doctor right away if you have nosebleeds, blood in the urine or stools, or any unusual bleeding or bruising.

While you are being treated with alemtuzumab, and after you stop treatment with it, do not have any immunizations (vaccinations) without your doctor's approval. You should receive live vaccines for at least 6 weeks before starting treatment with this medicine. You should not also receive alemtuzumab until 6 weeks after a varicella zoster virus (chicken pox) vaccination. Alemtuzumab may lower your body's resistance and there is a chance you might get the infection the immunization is meant to prevent. In addition, other persons living in your household should not take oral polio vaccine since there is a chance they could pass the polio virus on to you. Also, avoid persons who have taken oral polio vaccine within the last several months. Do not get close to them, and do not stay in the same room with them for very long. If you cannot take these precautions, you should consider wearing a protective face mask that covers the nose and mouth.

Alemtuzumab can temporarily lower the number of white blood cells in your blood, which will increase the risk of getting an infection. It can also lower the number of platelets, which are necessary for proper blood clotting. If this occurs, these are precautions you can take, especially when your blood count is low, to reduce the risk of infection or bleeding:

This medicine may increase your risk of developing infections. Avoid being near people who are sick or have infections while you are receiving this medicine. Wash your hands often. Tell your doctor if you have any kind of infection before you start receiving this medicine. Also tell your doctor if you have ever had an infection that would not go away or an infection that kept coming back. Tell your doctor right away if you have been exposed to someone with chickenpox.

If you are a female, you should have a human papilloma virus (HPV) screening every year to avoid getting a cervical HPV infection.

You will need to have a skin test for tuberculosis (TB) before you start this medicine. Tell your doctor if you or anyone in your home has ever had a positive TB skin test or been exposed to TB.

Do not eat foods that may contain a bacteria called Listeria, such as deli meat, unpasteurized milk and cheese products, or not properly cooked meat, seafood, or chicken. Make sure that the food you eat which may contain listeria is heated well when you receive this medicine.

Tell your doctor right away if you have unexplained weight gain or loss, constipation, fast, pounding, or uneven heartbeat, feeling cold, swelling of the eye. These may be symptoms of a thyroid problem.

This medicine may increase your risk of developing a serious and rare brain infection called progressive multifocal leukoencephalopathy (PML). Check with your doctor if you have weakness on one side of the body, clumsiness, blurred vision, changes in thinking, memory problems, confusion, or personality changes.

This medicine can increase your risk of having gallbladder (eg, acalculous cholecystitis) and lung problems (eg, pneumonitis). Check with your doctor right away if you have stomach pain or tenderness, fever, nausea, vomiting, trouble breathing, cough, chest pain or tightness, or coughing up blood.

Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.

Side Effects of Campath

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor or nurse immediately if any of the following side effects occur:

More common

Less common


Incidence not known

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

Less common


Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

Commonly used brand name(s)

In the U.S.

Available Dosage Forms:

Therapeutic Class: Antineoplastic Agent

Pharmacologic Class: Monoclonal Antibody

Frequently asked questions

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.