Why is this medication prescribed?

Fam-trastuzumab deruxtecan-nxki is a medication prescribed for the treatment of certain types of breast cancer. It is specifically used for patients with HER2-positive metastatic breast cancer who have received prior treatment with other HER2-targeted therapies. HER2-positive breast cancer is a subtype of breast cancer that overexpresses a protein called human epidermal growth factor receptor 2 (HER2), which promotes the growth of cancer cells.

Fam-trastuzumab deruxtecan-nxki is an antibody-drug conjugate that works by targeting HER2-positive cancer cells and delivering a chemotherapy drug directly to them, which helps to inhibit their growth and ultimately shrink the tumor.

How should this medicine be used?

Fam-trastuzumab deruxtecan-nxki injection should be administered under the supervision of a healthcare provider who is experienced in the use of cancer chemotherapy and in facilities equipped to manage potential infusion-related reactions. The dosage and administration schedule for Fam-trastuzumab deruxtecan-nxki may vary depending on factors such as the patient’s weight, overall health, and the specific type and stage of cancer being treated.

Typically, Fam-trastuzumab deruxtecan-nxki is administered as an intravenous infusion over a certain period of time. The infusion rate and duration may vary depending on the specific protocol recommended by the healthcare provider.

It is important for patients to receive regular medical check-ups and monitoring while receiving treatment with Fam-trastuzumab deruxtecan-nxki to assess for any potential side effects or complications. Patients should also follow any additional instructions provided by their healthcare provider regarding dietary restrictions, medications to be taken before or after the infusion, and any other relevant precautions.

As with any medication, it is essential for patients to communicate openly with their healthcare provider about any concerns or questions they may have regarding the use of Fam-trastuzumab deruxtecan-nxki.

Other uses for this medicine

Fam-trastuzumab deruxtecan-nxki injection is primarily indicated for the treatment of HER2-positive metastatic breast cancer in patients who have previously received other HER2-targeted therapies. However, it may also be investigated or used off-label for other types of cancer or medical conditions, depending on ongoing research and clinical trials. Off-label use refers to the use of a medication for purposes other than those approved by regulatory authorities based on scientific evidence and medical judgment.

What special precautions should I follow?

Special precautions should be taken when using Fam-trastuzumab deruxtecan-nxki injection, including:

• Medical History: Before starting treatment, inform your healthcare provider about your complete medical history, including any allergies, previous treatments, pre-existing medical conditions, and current medications. This information helps the healthcare provider determine the suitability of Fam-trastuzumab deruxtecan-nxki for you and develop an appropriate treatment plan.
• Cardiac Monitoring: Fam-trastuzumab deruxtecan-nxki may cause cardiac toxicity, including heart failure or decreased heart function. Cardiac function should be assessed before starting treatment and monitored regularly during treatment. If any signs or symptoms of cardiac dysfunction develop, such as shortness of breath, rapid weight gain, or swelling, notify your healthcare provider immediately.
• Interstitial Lung Disease (ILD): ILD, including pneumonitis and interstitial lung disease-related deaths, has been reported in patients treated with Fam-trastuzumab deruxtecan-nxki. Patients should be monitored for signs and symptoms of ILD, such as cough, difficulty breathing, or fever. Treatment should be interrupted or discontinued if ILD is suspected.
• Hematologic Toxicity: Fam-trastuzumab deruxtecan-nxki can cause hematologic toxicity, including neutropenia, anemia, and thrombocytopenia. Regular monitoring of blood cell counts is necessary during treatment, and dose modifications or treatment interruptions may be required based on the severity of hematologic toxicity.
• Pregnancy and Breastfeeding: Fam-trastuzumab deruxtecan-nxki may cause fetal harm when administered to pregnant individuals. Therefore, it should not be used during pregnancy unless the potential benefits outweigh the risks. Women of reproductive potential should use effective contraception during treatment and for at least seven months after the last dose. It is not known whether Fam-trastuzumab deruxtecan-nxki is excreted in human milk, so breastfeeding should be avoided during treatment and for at least seven months after the last dose.
• Infusion Reactions: Infusion-related reactions, including fever, chills, flushing, and hypotension, may occur during or after administration of Fam-trastuzumab deruxtecan-nxki. Patients should be monitored closely during infusion, and appropriate supportive care should be available.
• Drug Interactions: Inform your healthcare provider about all medications, supplements, and herbal products you are taking, as they may interact with Fam-trastuzumab deruxtecan-nxki and affect its efficacy or safety.

It’s essential to follow your healthcare provider’s instructions carefully and report any side effects or concerns promptly. They can provide guidance on managing side effects and adjusting treatment as needed.

What special dietary instructions should I follow?

As for special dietary instructions for Fam-trastuzumab deruxtecan-nxki Injection, there are no specific dietary restrictions associated with this medication. However, it’s important to maintain a balanced and healthy diet to support overall health and well-being during cancer treatment. Your healthcare provider or a registered dietitian can provide personalized dietary recommendations based on your individual needs and medical condition.

What should I do if I forget a dose?

If you forget a dose of Fam-trastuzumab deruxtecan-nxki Injection, contact your healthcare provider or treatment facility as soon as possible to discuss the best course of action. It’s important not to double up on doses to make up for a missed one unless specifically instructed by your healthcare provider. They will provide guidance on how to proceed based on your specific situation and treatment plan.

What side effects can this medication cause?

Fam-trastuzumab deruxtecan-nxki Injection can cause various side effects, which can vary in severity from person to person. Common side effects may include:

• Nausea and vomiting: These are common side effects of many chemotherapy medications, including Fam-trastuzumab deruxtecan-nxki.
• Fatigue: Feeling tired or weak is a common side effect of cancer treatment.
• Hair loss: Some people may experience hair thinning or hair loss while receiving Fam-trastuzumab deruxtecan-nxki.
• Decreased appetite: Some individuals may experience a reduced desire to eat or weight loss during treatment.
• Diarrhea or constipation: Changes in bowel habits, including diarrhea or constipation, can occur as a side effect of this medication.
• Anemia: Fam-trastuzumab deruxtecan-nxki can lower the number of red blood cells in the body, leading to anemia, which may cause symptoms such as fatigue, weakness, and shortness of breath.
• Neutropenia: This medication can also decrease the number of white blood cells, specifically neutrophils, which can increase the risk of infection.
• Febrile neutropenia: In some cases, neutropenia may lead to a fever, which requires prompt medical attention.
• Nail changes: Some people may experience changes in the nails, such as discoloration, ridges, or brittleness.
• Skin rash or dryness: Skin reactions, including rash, dryness, or itching, may occur during treatment with Fam-trastuzumab deruxtecan-nxki.
• Mucositis: Inflammation or irritation of the mucous membranes, particularly in the mouth or throat, can occur as a side effect of this medication.
• Cardiac toxicity: Fam-trastuzumab deruxtecan-nxki can affect heart function, leading to symptoms such as shortness of breath, chest pain, or irregular heartbeat.

It’s important to discuss any side effects or concerns with your healthcare provider. They can provide guidance on managing side effects and may recommend adjustments to your treatment plan if necessary. Additionally, seek medical attention promptly if you experience any severe or concerning side effects while receiving Fam-trastuzumab deruxtecan-nxki Injection.

What should I know about storage and disposal of this medication?

Regarding storage and disposal of Fam-trastuzumab deruxtecan-nxki injection:

• Storage: Fam-trastuzumab deruxtecan-nxki Injection should be stored in its original packaging at the recommended temperature, typically refrigerated between 2°C to 8°C (36°F to 46°F). Protect it from light by keeping it in the original carton until ready to use. Do not freeze. Keep it out of reach of children and pets.
• Disposal: Proper disposal of unused or expired medication is essential to prevent accidental ingestion or environmental contamination. Follow local regulations or guidelines for the disposal of chemotherapy drugs. Your healthcare provider or pharmacist can provide information on safe disposal methods.

In case of emergency/overdose

In case of an emergency or overdose with Fam-trastuzumab deruxtecan-nxki Injection, seek immediate medical attention or contact your local poison control center. Symptoms of overdose may include severe or prolonged side effects such as nausea, vomiting, diarrhea, fever, or cardiac symptoms like chest pain or irregular heartbeat.

What other information should I know?

It’s important to keep all appointments for medical tests and follow-up visits as recommended by your healthcare provider while receiving Fam-trastuzumab deruxtecan-nxki Injection. These appointments are necessary for monitoring your response to treatment, managing any side effects, and adjusting your treatment plan as needed. Inform your healthcare provider of any new symptoms or concerns that arise during treatment. Additionally, avoid receiving live vaccines during treatment with Fam-trastuzumab deruxtecan-nxki, as it may interfere with their effectiveness.

Always consult your healthcare provider or pharmacist if you have any questions or concerns about the storage, disposal, administration, or potential side effects of Fam-trastuzumab deruxtecan-nxki Injection. They can provide personalized guidance and support based on your individual needs and medical history.