Imatinib, commonly known as Glivec, is a targeted anticancer medication that inhibits specific enzymes called tyrosine kinases, which promote uncontrolled cancer cell growth. It is primarily prescribed for conditions like chronic myeloid leukaemia (CML) and gastrointestinal stromal tumours (GIST), transforming treatment outcomes for these diseases.
About imatinib tablets
Imatinib tablets belong to a class of drugs known as tyrosine kinase inhibitors (TKIs). These tablets work by blocking proteins on the surface of cancer cells that signal them to divide and multiply uncontrollably. By targeting the BCR-ABL tyrosine kinase in Philadelphia chromosome-positive CML or KIT (CD117) in GIST, imatinib halts cancer progression effectively.
The medication is available in 100 mg, 400 mg, and 600 mg strengths, allowing for precise dosing tailored to the patient’s condition, response, and tolerance. It has revolutionized care for adults and children with certain leukemias and stromal tumors, often used as first-line therapy or adjuvant treatment post-surgery for high-risk GIST.
Before starting imatinib, patients should inform their doctor about any history of hepatitis B, heart conditions, infections, pregnancy, breastfeeding, allergies, or concurrent medications, as these can affect safety and efficacy. Regular monitoring is essential due to potential impacts on blood counts, fluid retention, and organ function.
Before taking imatinib
To ensure safe use, disclose the following to your healthcare provider:
- If you have ever had a hepatitis B infection, as imatinib can reactivate it, potentially leading to severe liver damage.
- Any current infections or feeling unwell, since imatinib suppresses immunity.
- Heart conditions, due to risks of fluid retention or cardiac issues.
- If you are pregnant or breastfeeding, as it may harm the fetus or infant—effective contraception is required.
- All other medicines, including over-the-counter, herbal remedies like St John’s wort, or supplements, which may interact.
- History of allergic reactions to medicines.
Imatinib is prescribed by specialists experienced in oncology. Patients with low-risk GIST post-resection may not need adjuvant therapy. Baseline tests for liver, kidney, heart function, and blood counts are standard before initiation.
How to take imatinib
Follow your doctor’s instructions precisely, as outlined in the patient leaflet and prescription label. Imatinib is taken orally with a meal or snack to improve absorption and reduce stomach upset—swallow whole with a large glass of water to prevent esophageal irritation.
Dosing guidelines:
| Condition | Typical Starting Dose | Frequency |
|---|---|---|
| Chronic myeloid leukaemia (CML) | 400 mg or 600 mg | Once daily |
| Gastrointestinal stromal tumour (GIST) | 400 mg or 600 mg | Once or twice daily |
| Chronic eosinophilic leukaemia (CEL)/HES | 400 mg | Once daily |
| Children (dose per doctor) | Adjusted by body surface area | Once or twice daily |
Take at the same time each day for consistency. Your dose may combine tablet strengths and be adjusted based on response or side effects—never alter without medical advice. If crushing is needed (e.g., for administration via tube), mix in apple juice or water, stir until dissolved, and drink immediately.
Missed dose: Take as soon as remembered unless near the next dose—do not double up. Continue as long as it benefits you, often indefinitely unless side effects necessitate stopping.
Getting the most from your treatment
Attend all regular check-ups for progress monitoring, blood tests, weighing (to detect fluid retention), and potential dose adjustments. Imatinib can cause fluid retention (oedema), leading to swelling around eyes, ankles, or weight gain—report promptly.
- Avoid live vaccines (e.g., MMR, oral polio) due to infection risk from lowered immunity—discuss all immunisations with your doctor.
- Check interactions with OTC medicines like paracetamol (in cold remedies), painkillers, or St John’s wort, which reduce efficacy.
- Maintain a balanced diet, stay hydrated, and report any new symptoms immediately.
- For skin reactions or rashes, use gentle skincare; avoid grapefruit juice, which affects drug levels.
Long-term use requires vigilance for rare issues like liver enzyme elevation or heart failure—routine tests mitigate risks.
Possible side effects
Most side effects are manageable; report persistent or severe ones. Common issues affect over 10% of patients.
| Side Effect | Common (%) | Advice |
|---|---|---|
| Feeling sick (nausea)/vomiting, indigestion, diarrhoea | 30% | Simple foods, anti-sickness meds; hydrate for diarrhoea |
| Headache | Common | Water, suitable painkiller; inform doctor if persistent |
| Fluid retention (swelling, weight gain) | Common | Monitor weight; doctor may prescribe diuretics |
| Muscle/joint pain, cramps | Common | Calcium/magnesium supplements, pain relief like ibuprofen |
| Fatigue, dizziness, insomnia | Common | Rest; avoid driving/tools if dizzy |
| Rash, dry skin, hair loss | Common | Moisturise; speak to doctor |
| Anaemia, low blood counts | Monitored | Regular blood tests |
| Eye issues (blurred vision, conjunctivitis) | Less common | Ophthalmic check |
| Serious: Severe bleeding, liver failure, heart problems | Rare | Seek emergency care |
Other effects include nosebleeds, taste changes, abdominal pain, constipation, numbness, mouth ulcers. If you notice bruising, fever, fatigue, confusion, or jaundice, contact your doctor urgently—these may signal low platelets or hepatitis reactivation.
Frequently Asked Questions (FAQs)
Q: Can I take imatinib on an empty stomach?
A: No, take it with food or a snack to enhance absorption and minimize nausea.
Q: What if I miss a dose of imatinib?
A: Take it as soon as you remember, unless it’s almost time for the next—skip and resume schedule; never double dose.
Q: Does imatinib cause hair loss?
A: Yes, mild thinning or loss occurs in some; it’s usually reversible upon discontinuation.
Q: Is imatinib safe during pregnancy?
A: No, it can harm the fetus—use contraception and inform your doctor if pregnant.
Q: How long do I take imatinib?
A: Often long-term or as long as it controls your condition; do not stop without doctor approval.
Q: Can I drink alcohol while on imatinib?
A: Limit alcohol, as it may worsen side effects like liver strain—consult your doctor.
References
- Imatinib tablets (Glivec) — Patient.info. 2023. https://patient.info/medicine/imatinib-tablets-glivec-2
- Imatinib (Gleevec®): Uses & Side Effects — Cleveland Clinic. 2024-05-01. https://my.clevelandclinic.org/health/drugs/18142-imatinib-tablets
- Imatinib (Gleevec) Patient Information — Bone Marrow Transplant Programme. 2022. https://bonemarrowtransplant.co.za/wp-content/uploads/filr/1817/HE-I-030-GLEEVEC-Patient-Info.pdf
- Glivec | European Medicines Agency (EMA) — EMA. 2024-10-15. https://www.ema.europa.eu/en/medicines/human/EPAR/glivec
- Package leaflet: Glivec® 100 mg film-coated tablets — Medicines.org.uk (EMA-approved). 2023-11-20. https://www.medicines.org.uk/emc/files/pil.5566.pdf
- Imatinib (oral route) — Mayo Clinic. 2025-01-10. https://www.mayoclinic.org/drugs-supplements/imatinib-oral-route/description/drg-20068331
