Loncastuximab tesirine-lpyl injection is used to treat a certain type of non-Hodgkin’s lymphoma (NHL; a type of cancer that begins in a type of white blood cells that normally fights infection) that did not respond to or has returned after treatment with at least two other cancer treatments. Loncastuximab tesirine-lpyl is in a class of medications called antibody-drug conjugates. It works by killing cancer cells.

Loncastuximab tesirine-lpyl comes as a powder to be mixed with liquid and injected into a vein over 30 minutes by a doctor or nurse in a hospital or medical facility. It is usually injected once every 3 weeks for as long as your doctor recommends that you receive treatment.

Your doctor will probably treat you with another medication before and for 2 days after each dose to help prevent certain side effects. Your doctor may need to temporarily or permanently stop your treatment or decrease your dose of loncastuximab tesirine-lpyl during your treatment. This depends on how well the medication works for you and the side effects you experience. Be sure to tell your doctor how you are feeling during your treatment with loncastuximab tesirine-lpyl.

You should know that loncastuximab tesirine-lpyl should be administered only into a vein. However, it may leak into surrounding tissue causing severe irritation or damage. Your doctor or nurse will monitor the area near where the medication was injected. If you experience any of the following symptoms, tell your doctor immediately: pain, itching, redness, swelling, or sores near the place where the medication was injected.

Ask your pharmacist or doctor for a copy of the manufacturer’s information for the patient.

This medication may be prescribed for other uses; ask your doctor or pharmacist for more information.

Before receiving loncastuximab tesirine-lpyl injection,

• tell your doctor and pharmacist if you are allergic to loncastuximab tesirine-lpyl, any other medications, or any of the ingredients in loncastuximab tesirine-lpyl injection. Ask your pharmacist for a list of the ingredients.
• tell your doctor and pharmacist what other prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take.
• tell your doctor if you have or recently have had an infection or if you have or have ever had liver problems.
• tell your doctor if you are pregnant or plan to become pregnant, or if you plan to father a child. You or your partner should not become pregnant while you are receiving loncastuximab tesirine-lpyl. If you are female, you may need to have a pregnancy test before you start treatment, and you should use birth control to prevent pregnancy during your treatment with loncastuximab tesirine-lpyl and for 9 months after your final dose. If you are male, you and your female partner should use birth control during your treatment and continue to use birth control for 6 months after your final dose. Talk to your doctor about birth control methods that will work for you. If you or your partner become pregnant while taking loncastuximab tesirine-lpyl, call your doctor immediately. Loncastuximab tesirine-lpyl may harm the fetus.
• tell your doctor if you are breastfeeding. You should not breastfeed while you are receiving loncastuximab tesirine-lpyl and for 3 months after your final dose.
• you should know that this medication may decrease fertility in men. Talk to your doctor about the risks of receiving loncastuximab tesirine-lpyl injection.
• if you are having surgery, including dental surgery, tell the doctor or dentist that you are receiving loncastuximab tesirine-lpyl injection.
• plan to avoid unnecessary or prolonged exposure to sunlight and to wear protective clothing, sunglasses, and sunscreen. Loncastuximab tesirine-lpyl may make your skin sensitive to sunlight.

Unless your doctor tells you otherwise, continue your normal diet.

Loncastuximab tesirine-lpyl may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

• unusual tiredness or weakness
• nausea
• diarrhea
• stomach pain
• constipation
• decreased appetite
• muscle or joint pain
• darkening of skin

Some side effects can be serious. If you experience any of these symptoms, call your doctor immediately or get emergency medical treatment:

• rash
• itching
• blistering or peeling skin
• swelling of the hands, feet, ankles, or lower leg
• weight gain
• swelling of the stomach area
• shortness of breath
• difficulty breathing
• chest pain
• fever, chills, headache, sore throat, ongoing cough and congestion, or other signs of infection
• warm, red, painful or swollen skin following a cut or scrape
• unusual bleeding or bruising

Loncastuximab tesirine-lpyl may cause other side effects. Call your doctor if you have any unusual problems while taking this medication.

If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration’s (FDA) MedWatch Adverse Event Reporting program online (http://www.fda.gov/Safety/MedWatch) or by phone (1-800-332-1088).

In case of overdose, call the poison control helpline at 1-800-222-1222. Information is also available online at https://www.poisonhelp.org/help. If the victim has collapsed, had a seizure, has trouble breathing, or can’t be awakened, immediately call emergency services at 911.

Keep all appointments with your doctor and the laboratory. Your doctor will order certain lab tests to check your body’s response to loncastuximab tesirine-lpyl injection.

It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.

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