Tarlatamab-dlle (Imdelltr®)

These are some of the most common or most serious side effects of this medication. Talk with your provider about the side effects you are having and how they can be managed.

Cytokine release syndrome (CRS) is an inflammatory reaction that affects your whole body. This medication can cause a quick and sudden release of cytokines (proteins) from your immune cells into your blood. Your body may become overwhelmed by this release of cytokines. 

Symptoms of CRS include

• Fever.
• Fatigue.
• Nausea or vomiting.
• Feeling dizzy or lightheaded.
• Headache.
• Trouble breathing or swallowing.
• Swelling of your face.
• Chest pain or racing heartbeat.
• Coughing or wheezing.

This can be a very serious side effect. Let your provider know right away so that treatment can be started if needed.

This medication can cause serious infections, with or without a decrease in white blood cell counts.

White blood cells (WBC) help your body fight infection. While you are having cancer treatment, your WBC count can drop, putting you at a higher risk of an infection. Tell your provider right away if you have a fever (a temperature greater than 100.4°F or 38°C), sore throat or cold, shortness of breath, cough, burning with urination, or a sore that doesn't heal.

Tips for preventing infection:

• Hand washing,  both yours and your visitors, is the best way to prevent the spread of infection.
• Avoid large crowds and people who are sick (those who have a cold, fever, or cough, or if someone you live with has these symptoms).
• When working outside, wear clothes that protect you, like long pants and gloves.
• Do not handle pet waste.
• Keep all cuts and scratches clean.
• Shower or bathe daily.
• Brush your teeth at least twice a day.
• Do not cut cuticles or ingrown nails. You may wear nail polish, but not fake nails.
• Ask your providers before scheduling dental appointments or procedures.

Ask your providers before you or someone you live with has any vaccines. 

Fatigue can cause exhaustion, feeling worn out and that your body is "heavy" and hard to move, or being unable to focus. It is common when you have cancer, and it is not the same as feeling tired. You may need to adjust your schedule to manage fatigue. Plan times to rest during the day and save your energy for more important activities. Exercise can help lessen fatigue. Talk to your providers about ways to deal with this side effect.

Nutrition is an important part of your care. Cancer treatment can affect your appetite and make it hard to eat. Ask your provider about nutrition counseling services. Some tips you can follow are:

• Try to eat five or six small meals or snacks during the day, instead of 3 larger meals.
• Nutritional supplements may help if you are not eating enough.
• You may have a metallic taste or find that food has no taste. You may dislike foods or beverages that you liked before cancer treatment. These symptoms can last for months or longer after treatment ends.
• Avoid any food that you think smells or tastes bad. If red meat is a problem, eat chicken, turkey, eggs, dairy products, and fish without a strong smell. Sometimes cold food has less of an odor.
• Add extra flavor to meat or fish by marinating it in sweet juices, sweet and sour sauce, or dressing.
• Use seasonings like basil, oregano, or rosemary to add flavor.

Anemia is when your red blood cell count is lower than normal. Red blood cells carry oxygen to the tissues in your body. When your red cell count is low, you may feel tired or weak. Tell your providers if you have shortness of breath, trouble breathing, or pain in your chest. If your count gets too low, you may receive a blood transfusion.

This medication can affect your electrolytes (potassium, magnesium, sodium, calcium, etc.). Your electrolyte levels will be checked with blood tests. If your levels get too low, you may be given electrolytes by IV (intravenously through your vein) or by mouth. Talk to your provider before taking any supplements. 

This medication can cause liver toxicity, or liver problems, which your provider may monitor for with blood tests called liver function tests. Symptoms may be:

• Yellowing of your skin or eyes.
• Dark or brown urine.
• Pain in your abdomen (belly).

Tell your provider if you have any of these symptoms.

Platelets are blood cells that help your blood clot. Thrombocytopenia is when your platelet count is lower than normal, and you are at a higher risk of bleeding. Tell your providers if you have any bruising or bleeding, including nose bleeds, bleeding gums, or blood in your urine or stool. If your count gets too low, you may receive platelets from a donor. 

• Do not use a razor (an electric razor is fine).
• Do not do activities that can cause injury or bleeding.
• Talk to your provider before taking any non-steroidal, anti-inflammatory medications (NSAIDs) like Motrin/Advil (ibuprofen), Aleve (naproxen), Celebrex (celecoxib), and others. These can raise the risk of bleeding. 
• Use a soft-bristle toothbrush to brush your teeth. Ask your provider about flossing or using toothpicks. 

You may have joint or muscle pain/aches and headaches while taking this medication. Your provider can recommend medications and other ways to help relieve your pain.

Constipation is when you have less bowel movements than usual or are having trouble passing stool. To relieve constipation, you can include fiber in your diet (fruits like prunes, apples, peaches, and pear nectars/juices), drink 8 to 10 glasses of non-alcoholic fluids a day, and stay active. Taking a stool softener once or twice a day can prevent constipation. If you do not have a bowel movement for 2 to 3 days, call your provider. 

This medication can cause kidney problems, like an increased creatinine level. Your provider may monitor for kidney problems with blood tests. Symptoms may be:

• Less urine output than normal.
• Blood in the urine.
• Swelling in the ankles.
• Loss of appetite.

Tell your provider if you have any of these symptoms.

Talk to your providers if you have nausea and/or vomiting. They can prescribe medications to help you. Making changes to your diet can also help. Avoid things that make your symptoms worse, like heavy or greasy/fatty foods and spicy or acidic foods, like tomatoes, lemons, and oranges. Try saltines or ginger ale to help your symptoms.  

Call your providers if you cannot keep fluids down for more than 12 hours or if you feel lightheaded or dizzy.

There is a higher risk of health problems for your baby if you are pregnant, become pregnant, or get someone pregnant while on this medication. To lower the risk of birth defects, you should use birth control (contraception) to avoid pregnancy. Talk with your provider about what kind of birth control is safest for you and your partner.

Some people may have an allergic reaction to this medication. Signs of an allergic reaction are:

• Shortness of breath or trouble breathing.
• Chest pain.
• Rash.
• Itching.
• Flushing (reddening of the skin, often on the face, neck, or chest).
• A drop in blood pressure (you may feel lightheaded, dizzy, or weak).

If you have any of these signs while you are getting an infusion, tell your provider right away. The infusion will be slowed down or stopped. Depending on your reaction, you may still be able to get the medication if you are given medicine to prevent a reaction or if the medication is given at a slower rate.