Dacomitinib is taken as a tablet by mouth. Here’s how to use it:

• Follow Your Doctor’s Instructions: Always take Dacomitinib exactly as prescribed by your doctor. Do not take more or less than the prescribed amount.
• Take Once a Day: Dacomitinib is usually taken once a day, at the same time each day, to help remember.
• With or Without Food: You can take Dacomitinib with or without food. Swallow the tablet whole with a glass of water. Do not crush, chew, or break the tablet, as it can affect how the medication works.
• Missed Dose: If you miss a dose, take it as soon as you remember unless it is close to the time for your next dose. Do not take two doses at once to make up for a missed dose.

If you have any concerns or questions about taking Dacomitinib, consult your healthcare provider or pharmacist.

Dacomitinib belongs to a class of drugs known as tyrosine kinase inhibitors (TKIs). These drugs work by targeting and blocking the activity of specific proteins that contribute to cancer cell growth. In the case of Dacomitinib, it specifically targets the EGFR protein.

Here’s how Dacomitinib works:

• Blocking EGFR Activity: The EGFR protein is often overactive in cancer cells, signaling them to grow and divide uncontrollably. Dacomitinib blocks the signals from the EGFR protein, slowing down the growth of cancer cells.
• Preventing Cancer Cell Spread: By blocking EGFR, Dacomitinib also helps prevent the spread of cancer cells to other parts of the body.
• Inhibiting Tumor Growth: As a tyrosine kinase inhibitor, Dacomitinib inhibits multiple pathways involved in tumor growth and survival, making it effective against cancer cells that are dependent on the EGFR protein.

Like all medications, Dacomitinib can cause side effects. Not everyone will experience these side effects, and some people may have only mild symptoms. Common side effects include:

• Diarrhea: A common side effect of Dacomitinib, which may be mild or severe. It’s important to stay hydrated and notify your doctor if diarrhea becomes severe.
• Skin Rashes: Some patients may develop a rash, especially on the face, neck, or upper body. This is a common side effect of EGFR inhibitors.
• Mouth Sores: Some people may develop painful sores in the mouth or throat, which can make eating and swallowing difficult.
• Fatigue: Feeling tired or weak is common during treatment with Dacomitinib.

Serious side effects (which require immediate medical attention) include:

• Lung Problems: Dacomitinib can cause lung issues, such as shortness of breath or a persistent cough. These can be signs of interstitial lung disease (ILD), which can be life-threatening.
• Severe Skin Reactions: In rare cases, Dacomitinib can cause severe skin reactions, such as blistering or peeling skin.
• Liver Problems: Symptoms like yellowing of the skin or eyes (jaundice), dark urine, or stomach pain could indicate liver issues.

If you experience any severe side effects, contact your doctor immediately.

Before starting treatment with Dacomitinib, it is important to be aware of the following warnings and precautions:

• Lung Health: Dacomitinib can cause serious lung issues, including interstitial lung disease. Let your doctor know if you have a history of lung disease or breathing problems before starting treatment.
• Skin Reactions: Since Dacomitinib can cause skin rashes and other skin problems, your doctor may monitor your skin closely during treatment.
• Liver Function: Dacomitinib can affect liver function, so your doctor will likely monitor your liver health during treatment.
• Pregnancy and Breastfeeding: Dacomitinib should not be used during pregnancy as it may harm the unborn baby. If you are breastfeeding, discuss with your doctor whether you should stop breastfeeding during treatment.

Dacomitinib can interact with other medications, which may either increase the risk of side effects or affect how well the drug works. Some potential interactions include:

• Other Cancer Medications: Combining Dacomitinib with certain other cancer treatments can increase the risk of side effects, such as liver problems or lung issues.
• Medications Affecting the Liver: Dacomitinib is processed in the liver, so medications that affect liver function may alter how the drug works. Always inform your doctor about any other medications you are taking.
• Antacids and Proton Pump Inhibitors (PPIs): Certain medications used to treat acid reflux or stomach ulcers may affect the absorption of Dacomitinib. These should be taken at different times of the day from Dacomitinib.

It is essential to inform your doctor about all other medications, including over-the-counter drugs and supplements, to avoid harmful interactions.

The typical dosage of Dacomitinib is:

• 45 mg once daily, taken by mouth, with or without food.

Your doctor may adjust the dose depending on how you respond to the medication and if you experience any side effects. It is essential to follow your healthcare provider’s instructions carefully to get the best results.

Dacomitinib is available only by prescription and must be prescribed and monitored by a healthcare provider. Your doctor will evaluate whether Dacomitinib is appropriate for your type of cancer and specific condition. Regular check-ups and monitoring will be necessary during treatment to track your response and manage any side effects.

If you have any questions or concerns about using Dacomitinib, speak with your healthcare provider for more information.

1. What is Dacomitinib used for?
   Dacomitinib is used to treat non-small cell lung cancer (NSCLC) with specific EGFR gene mutations.

2. How does Dacomitinib work?
   It blocks the activity of the epidermal growth factor receptor (EGFR), inhibiting cancer cell growth.

3. What is the administration method for Dacomitinib?
   Dacomitinib is taken orally in tablet form.

4. Is Dacomitinib a targeted therapy?
   Yes, it’s a second-generation EGFR tyrosine kinase inhibitor (TKI).

5. What are the common side effects of Dacomitinib?
   Side effects include diarrhea, rash, dry skin, stomatitis, and hair changes.

6. Can Dacomitinib be taken with food?
   It is generally recommended to take it on an empty stomach for better absorption.

7. Is Dacomitinib used for all lung cancers?
   No, it is specifically used for EGFR mutation-positive NSCLC.

8. How long does it take to see effects from Dacomitinib?
   Response times vary, but typically several weeks to months.

9. Can Dacomitinib cause severe skin reactions?
   Yes, serious skin reactions may occur and should be monitored.

10. What should patients avoid when taking Dacomitinib?
    Avoid grapefruit products and certain medications that interact with it.

11. Does Dacomitinib affect liver function?
    Liver function should be monitored during treatment as it can cause liver toxicity.

12. Is Dacomitinib safe during pregnancy?
    No, it may cause harm to the fetus and should not be used during pregnancy.

13. Can Dacomitinib cause diarrhea?
    Yes, diarrhea is one of the most common side effects.

14. How is dosing adjusted if side effects occur?
    Dose reductions or interruptions may be done based on severity.

15. Is Dacomitinib used alone or with other drugs?
    It is typically used as monotherapy in eligible patients.

16. What is the usual dose of Dacomitinib?
    Typically, 45 mg once daily, but this varies per patient.

17. Are there any known drug interactions with Dacomitinib?
    Yes, especially with CYP2D6 inhibitors and inducers.

18. Can Dacomitinib cause hair loss?
    Hair changes including thinning or loss can occur.

19. How is treatment response monitored?
    Through imaging studies and clinical evaluation.

20. What should be done in case of overdose?
    Immediate medical attention is required; supportive treatment given.