Dasatinib (Tasigna® and generics) — Patient Information for Australia

Dasatinib is a medicine used to treat certain cancers of the blood (haematological malignancies). It works by targeting specific proteins that drive abnormal cell growth and survival. This guide explains what dasatinib does, how it works, how it’s used, and what to consider to help you use it safely and effectively in Australia.

Please note: this information is general. Your treating team may adjust details based on your condition, blood results, and side effects.

Basic product information

How dasatinib works (mechanism of action)

Dasatinib belongs to a group of medicines called tyrosine kinase inhibitors (TKIs). It blocks enzyme activity from several cancer-driving “kinase” proteins, most importantly those involved in chronic myeloid leukaemia (CML) and certain forms of Philadelphia chromosome–positive cancers.

• BCR-ABL: Dasatinib inhibits the abnormal BCR-ABL signalling found in CML and some other conditions.
• Other kinase targets: It can also inhibit kinases involved in cell growth and survival pathways.
• Result: By blocking these signals, dasatinib helps reduce cancer cell proliferation and can lead to disease control.

The goal of treatment is to achieve and maintain a meaningful response in your disease while keeping side effects manageable.

Pharmacokinetics (how the body handles dasatinib)

“Pharmacokinetics” describes what happens to a medicine in the body: absorption, distribution, metabolism, and elimination. Key points for dasatinib include:

• Absorption: Dasatinib is absorbed after oral dosing. Food—especially high-fat meals—can substantially increase drug levels, which may raise the risk of side effects.
• Peak levels: Blood concentrations rise after dosing and peak within hours (exact timing varies between individuals).
• Metabolism: The liver metabolises dasatinib mainly via CYP3A4 (a drug-metabolising enzyme). This means other medicines that affect CYP3A4 can alter dasatinib levels.
• Elimination: Dasatinib and its metabolites are eliminated primarily via bile/feces, with a smaller amount via urine.
• Variability: Blood levels can vary depending on diet, other medicines, liver function, and individual factors.

Your care team may adjust dosing based on response and tolerability, and will typically monitor blood tests regularly.

Typical use in Australia

Dasatinib is commonly used for certain types of leukaemia, including:

• Chronic myeloid leukaemia (CML):
  • in chronic phase,
  • in accelerated phase, and/or
  • in blast crisis
• Philadelphia chromosome–positive acute lymphoblastic leukaemia (Ph+ ALL), in selected situations.
• In practice, the exact indication depends on disease stage, prior treatments, mutation status, and local eligibility criteria.

Your doctor will confirm that dasatinib is appropriate for your specific diagnosis and risk profile.

Timing and how to take dasatinib

Correct timing helps maintain consistent absorption and reduces the risk of side effects. A key point is food interaction, described in detail below.

General dosing schedule

• Dasatinib is taken by mouth on a fixed schedule (commonly once or twice daily depending on the regimen).
• Try to take each dose at about the same time each day.
• Swallow tablets whole (do not crush or split unless your product information explicitly says otherwise).

Missed dose

• If you miss a dose, take it when you remember if it’s close to the next scheduled dose.
• If it’s near the next dose, skip the missed dose and continue your schedule.
• Do not take double doses to make up for a missed one.
• Ask your pharmacist for guidance tailored to your dosing timetable.

If you need to stop or delay doses due to side effects, follow the plan provided by your treating team.

Food interactions (important)

Food, especially high-fat meals, can significantly increase dasatinib exposure. That can raise the likelihood of side effects such as fluid retention, blood count changes, or gastrointestinal effects.

Practical advice

• Take dasatinib without food, or follow the specific instructions for your product regarding meals.
• If you must eat, allow enough time after dosing for absorption to occur as directed by your doctor or the product leaflet.
• Avoid taking with large, fatty meals unless specifically advised.

Alcohol with meals

Alcohol doesn’t usually directly replace the need for meal timing, but drinking alcohol may worsen fatigue, nausea, and liver strain. If you drink alcohol, discuss it with your doctor—particularly if you have liver test abnormalities.

Alcohol interactions

Dasatinib is processed largely by the liver, so alcohol may increase strain on the liver and may worsen side effects such as:

• Nausea or stomach upset
• Fatigue
• Headache
• Abnormal liver function tests (if alcohol is heavy or frequent)

For most people, avoiding or limiting alcohol is sensible during treatment. If you choose to drink, keep it moderate and discuss your intake with your clinician—especially if you have liver issues, hepatitis, or elevated liver enzymes.

Medicine interactions (including CYP3A4 and acid reducers)

Dasatinib can interact with other medicines because it is metabolised by enzymes (especially CYP3A4) and because its absorption can be affected by changes in stomach acidity. Always tell your doctor and pharmacist about all medicines you take, including over-the-counter products and herbal supplements.

Common interaction categories

• Acid-reducing medicines (gastric pH modifiers):
  • Examples include proton pump inhibitors (PPIs) and some H2 blockers.
  • These can reduce dasatinib absorption and may reduce effectiveness.
  • Your clinician may advise avoiding them or using alternatives.
• CYP3A4 inhibitors (can increase dasatinib levels):
  • Some antifungals, certain antibiotics, and medicines used for HIV may inhibit CYP3A4.
  • Increased levels can raise the risk of side effects.
• CYP3A4 inducers (can decrease dasatinib levels):
  • Some seizure medicines and certain herbal products can induce metabolism.
  • Reduced levels can reduce effectiveness.
• Anticoagulants/antiplatelet medicines:
  • Bleeding risk may be affected, especially if platelet counts are low.
  • Your doctor may adjust monitoring or treatment.
• Herbal supplements:
  • Some (including St John’s wort) can affect CYP enzymes and change dasatinib exposure.
  • Avoid starting herbal products without checking.

Grapefruit and related products

Because grapefruit can affect drug-metabolising enzymes, it may increase dasatinib levels. It is typically recommended to avoid grapefruit and grapefruit juice during treatment unless your pharmacist says otherwise.

Indications and expected outcomes

Dasatinib is used to treat cancers where specific tyrosine kinase signalling (such as BCR-ABL) is driving disease. The “indication” refers to the reason the medicine is prescribed.

• CML:
  • achieve and maintain disease control in chronic phase and in more advanced phases, depending on your situation.
• Ph+ ALL:
  • used in selected patients, often as part of a treatment plan.

Response can vary. Some people may experience improvement in symptoms and blood counts, while others may respond primarily on lab measures. Your team will guide you on how response is assessed (for example, via blood tests and molecular monitoring).

Dosing (overview)

Dasatinib dosing depends on:

• your diagnosis (CML phase, Ph+ ALL)
• your age and overall health
• previous treatments
• how you tolerate the medicine and blood test results
• drug interactions

Your care plan will specify the exact strength and schedule for you. In general, dosing regimens for dasatinib can be once or twice daily depending on the indication and local guidance.

Tablet strength and adjustments

• Do not change your dose without clinical advice.
• If side effects occur, clinicians may recommend dose interruptions or dose reductions.
• Regular blood tests are important to guide safe use.

If you are unsure about your dose, check the label on your product package or ask your pharmacist.

Safety profile and important side effects

Like all medicines, dasatinib can cause side effects. Many are manageable with monitoring and supportive care, but some require urgent medical attention. This section summarises common and serious risks.

Common side effects

• Nausea, indigestion, diarrhoea
• Fatigue or weakness
• Headache
• Rash or skin changes
• Low blood counts (anaemia, neutropenia, thrombocytopenia), which can increase infection and bleeding risk
• Fluid retention (swelling, sometimes around the body or in the lungs), reported in some people

Serious side effects — seek urgent medical help if

• Breathlessness, chest pain, or wheezing
• Rapid weight gain or significant swelling (especially with shortness of breath)
• Uncontrolled bleeding, black/tarry stools, or blood in vomit/urine
• Signs of infection such as fever, chills, or persistent sore throat
• Severe allergic-type reactions (facial swelling, hives, difficulty breathing)

Monitoring to support safe use

• Full blood count regularly to detect low neutrophils, platelets, and anaemia
• Liver function tests to monitor metabolic effects
• Electrolytes and kidney-related tests as directed
• Clinical assessment of fluid symptoms and breathing status

Tell your doctor promptly about new symptoms, even if you think they might be mild.

Practical use tips (day-to-day guidance)

• Keep a schedule: Use alarms or a medication diary to stay consistent.
• Follow meal timing: Avoid high-fat meals and follow the exact food instructions provided for your product.
• Hydration: Maintain adequate fluids unless you have been told to restrict fluids (for example, for heart or kidney issues).
• Infection prevention:
  • Practice good hand hygiene.
  • Ask your clinician whether vaccinations are appropriate for you.
• Bleeding precautions:
  • Be careful with activities that increase injury risk.
  • Avoid unnecessary use of NSAIDs (ibuprofen/naproxen) unless approved, as they may affect bleeding risk.
• Skin care: Use gentle moisturisers if rash occurs; ask your pharmacist about suitable options.
• Report breathing changes early: Prompt assessment helps manage fluid-related side effects.

Alternatives to dasatinib

Treatment choices depend on your diagnosis, disease phase, mutation profile, and prior therapy. There are multiple tyrosine kinase inhibitors used for CML and Ph+ ALL depending on eligibility. Alternatives may include:

• Imatinib
• Nilotinib
• Bosutinib
• Ponatinib (used in selected circumstances, with specific risk considerations)
• Other regimen-based therapies may be considered for some patients

Your doctor can explain which options are suitable for you and why. Don’t switch between TKIs without advice, as dose timing and interaction profiles can differ.

Market, legal, and funding context in Australia

In Australia, access to cancer medicines is managed through the Australian health system, including:

• Regulatory approval through the TGA (Therapeutic Goods Administration).
• Prescribing and clinical oversight within the healthcare system.
• Access pathways such as the Pharmaceutical Benefits Scheme (PBS) or hospital arrangements, depending on the medicine and patient criteria.
• Special arrangements may apply for certain cancer treatments (for example, via hospital dispensing).

Availability and funding can vary by diagnosis category and personal eligibility. Your treating team can advise on local access pathways.

Recent guidance and best-practice reminders

Guidance for dasatinib use evolves as new evidence emerges, including information about monitoring and managing side effects. Common themes in clinical practice include:

• Dietary consistency: strong emphasis on managing food effects on absorption.
• Drug interaction review at each visit, particularly for acid-reducing medicines and CYP3A4 modifiers.
• Regular blood monitoring to detect cytopenias early.
• Management of fluid-related effects, including prompt assessment of breathing symptoms.

If you start any new medicine (including OTC products), it’s wise to ask your pharmacist whether it could interact with dasatinib.

Delivery and availability (online pharmacy guidance)

Dasatinib supply depends on the specific brand/generic, strength, and local stock availability. When ordering online in Australia:

• Orders are typically processed through authorised channels.
• Delivery timeframes depend on your location and courier service.
• Medicines are supplied in original packaging with clear product identification and instructions.

Always check the product strength and dosing instructions before use. If the packaging differs from what you previously had (for example, tablet strength), confirm with your pharmacist.

FAQ — Dasatinib (patient-friendly)

1) What is dasatinib used for?

Dasatinib is used for certain blood cancers, particularly: chronic myeloid leukaemia (CML) and Philadelphia chromosome–positive acute lymphoblastic leukaemia (Ph+ ALL) in selected patients.

2) How should I take it with food?

Food can affect absorption. Many patients are advised to take dasatinib without food and to avoid high-fat meals around dosing. Follow the exact instructions from your medicine label and healthcare team.

3) Can I drink alcohol while taking dasatinib?

Alcohol may increase liver strain and can worsen side effects like nausea and fatigue. If you drink, keep it moderate and discuss your intake with your doctor, especially if you have liver test abnormalities.

4) What medicines commonly interact with dasatinib?

Important interactions include: acid-reducing medicines (which can affect absorption), and medicines that affect CYP3A4 metabolism (which can change dasatinib levels). Tell your pharmacist about all medicines and supplements you use.

5) What should I do if I miss a dose?

If you miss a dose, take it only if it’s close to the next scheduled dose; otherwise skip and continue as planned. Do not double up. Ask your pharmacist if you’re unsure based on your timetable.

6) What are the most concerning side effects?

Seek urgent help for symptoms such as breathlessness, chest pain, significant swelling, uncontrolled bleeding, severe infection signs (fever), or signs of a serious allergic reaction.

7) Will I need regular blood tests?

Yes. Regular monitoring is a key part of safe therapy, including full blood counts and liver function tests.

8) Can I take antacids or medicines for reflux?

Some reflux treatments can interact with dasatinib by changing stomach acidity. Ask your pharmacist which options are suitable and whether timing adjustments are needed.

9) Are there alternatives if I can’t tolerate dasatinib?

Yes. Depending on your diagnosis and response, your clinician may consider other TKIs or different treatment strategies. Discuss options if side effects become difficult to manage.

10) How long does treatment usually continue?

Many people take dasatinib for an extended period, but the duration depends on your response, side effects, and disease course. Your clinician will review your progress regularly.

If you have questions about how to use dasatinib safely—especially regarding food, interacting medicines, or side effects— contact your pharmacist or treating team for personalised advice.