What are the side effects of zotuximab? How to take effective countermeasures according to the severity of side effects?

Zolbetuximab (Zolbetuximab) is a targeted immunotherapy for the treatment of gastrointestinal cancer, specifically gastric cancer and gastrointestinal tumors with CLDN18.2 expression. As a targeted antibody drug, zotuximab inhibits the proliferation of tumor cells and enhances the immune system's recognition and attack of cancer cells by binding to the CLDN18.2 protein on the surface of cancer cells. However, like other targeted drugs, zotuximab may also cause some side effects. Patients should pay attention to these potential adverse reactions when using it and take corresponding measures according to the severity of the side effects.

1. Common side effects

Common side effects of zotuximab include, but are not limited to, the following:

Injection site reactions: including redness, swelling, pain, induration, etc. This type of reaction is usually more common after drug injection. In most cases, the symptoms are mild and will gradually improve over time.

Nausea and Vomiting: Approximately some patients experience nausea and vomiting after taking zotuximab, especially when starting treatment.

Fatigue: Patients may experience extreme fatigue, which often affects their ability to perform daily activities.

Loss of appetite: This side effect is also relatively common and may cause patients to eat less, further aggravating fatigue.

2. Serious side effects

Although most side effects are mild and can be relieved within a short period of time, zotuximab may also cause some serious adverse reactions, which require close attention and prompt treatment:

Allergic reactions: including shortness of breath, facial swelling, rash and other allergic symptoms. In rare cases, severe allergic reactions, such as anaphylactic shock, may occur, in which case the patient should stop taking the medication immediately and receive emergency treatment.

Gastrointestinal reactions: Some patients may experience severe gastrointestinal reactions, such as diarrhea, constipation, abdominal pain, etc. This situation requires management based on the severity of the symptoms. If diarrhea is frequent or accompanied by dehydration, fluids should be rehydrated and anti-diarrhoeal medications should be considered.

Blood system reactions: such as leukopenia, thrombocytopenia, etc., may affect the patient's immune function and hemostatic ability. Regular blood tests are performed for early detection and intervention.

3. Countermeasures

In response to the above side effects, patients should take the following measures according to the severity of the side effects:

Mild side effects:

Injection site reaction: For local discomfort, mild cold compress or topical anti-inflammatory drugs can be used to help relieve symptoms.

Nausea, vomiting, and loss of appetite: Mild nausea and vomiting can be relieved by appetite-stimulating drugs (such as meclizine). At the same time, arranging your diet reasonably, eating in multiple meals, and avoiding greasy foods can help alleviate these symptoms.

Fatigue: Maintain appropriate rest, avoid overexertion, and perform moderate exercise when necessary to help restore physical strength.

Serious side effects:

Anaphylaxis: For allergic reactions, especially severe allergic reactions (such as difficulty breathing, facial swelling), you should immediately stop using zotuximab and seek emergency treatment, such as epinephrine and other drugs. Patients with allergic reactions need to choose whether to continue treatment under the guidance of their doctor.

Gastrointestinal reactions: If you experience severe gastrointestinal discomfort, such as severe diarrhea or constipation, you should report it to your doctor promptly. Your doctor may recommend suspending or reducing the dose of the medication, using anti-diarrhoeal medications, rehydration, or other symptomatic treatments.

Blood system reaction: If abnormal blood routine test results are found (such as leukopenia or thrombocytopenia), the doctor should be notified in time, and treatment may need to be suspended or drug adjustments may be made. At the same time, corresponding supportive treatment (such as granulocyte stimulating factor, hemostatic drugs, etc.) may be given according to the situation.

4. Regular monitoring and timely adjustments

Patients taking zotuximab should undergo regular blood tests, liver and kidney function tests, and closely monitor adverse reactions caused by the drug. For patients who experience more serious side effects, doctors should promptly adjust the treatment plan according to individual circumstances, including reducing the dose, suspending treatment, or discontinuing medication. In addition, patients should maintain close contact with their doctors during use and promptly report any discomfort so that appropriate treatment can be carried out.

Zotuximab, a targeted immunotherapy drug, can significantly improve the treatment of certain types of cancer, but it may also be associated with some side effects. Patients should pay close attention to their body's reaction during treatment and work with their doctor to develop reasonable response measures. By promptly monitoring and adjusting the treatment plan, the occurrence of side effects can be minimized and the safety and effectiveness of the treatment can be ensured.

Reference materials:https://www.astellas.com/en/news/29401