Before receiving alemtuzumab, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: immune system problems (such as HIV), recent/current infections (such as tuberculosis), bleeding/blood problems, high blood pressure, stroke, cancer, kidney problems, heart problems, blood vessel problems (such as tears in arteries), thyroid problems.

This drug may make you dizzy. Alcohol or marijuana (cannabis) can make you more dizzy. Do not drive, use machinery, or do anything that needs alertness until you can do it safely. Limit alcoholic beverages. Talk to your doctor if you are using marijuana (cannabis).

Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

Before receiving a blood transfusion, tell your doctor that you are using this medication.

Tell your doctor your vaccine history and ask if you need to get any vaccines before starting treatment with this medication. Your doctor may direct you to have any required vaccines at least 6 weeks before starting this medication. Tell your health care professional that you are using alemtuzumab before having any immunizations/vaccinations. Avoid contact with people who have recently received live vaccines (such as flu vaccine inhaled through the nose).

Wash your hands well to prevent the spread of infections.

This medication also increases your risk of getting a very serious infection caused by a bacteria called listeria. During treatment and for some time after treatment with this medication, either avoid food that may contain listeria (such as deli meat, unpasteurized milk and cheese products, soft cheeses, undercooked meat/seafood/poultry), or make sure you heat it well. Ask your doctor for more details.

To lower the chance of getting cut, bruised, or injured, use caution with sharp objects like razors and nail cutters, and avoid activities such as contact sports.

Tell your doctor if you are pregnant or plan to become pregnant. You should not become pregnant while using alemtuzumab. Alemtuzumab may harm an unborn baby. Your doctor should order a pregnancy test before you start this medication. Ask about reliable forms of birth control while using this medication and for 4 months after the last dose. If you become pregnant, talk to your doctor right away about the risks and benefits of this medication.

It is unknown if this drug passes into breast milk. Because of the possible risk to the infant, breastfeeding is not recommended while using this drug and for at least 4 months after the last dose. Consult your doctor before breastfeeding.