Side Effects of Imatinib (Glivec)

What Patients Should Expect After GIST Surgery

What are the side effects of imatinib (Glivec)?

After surgery for a gastrointestinal stromal tumour (GIST), some patients are prescribed imatinib (Glivec) to reduce the risk of the tumour returning.

One of the most common concerns patients have is:

 

“What side effects should I expect?”

 

Imatinib is a targeted therapy, which means it works differently from traditional chemotherapy. As a result, the side effects are often less severe and more manageable, although they can still vary between individuals.

Is imatinib the same as chemotherapy?

No. Imatinib is not a conventional chemotherapy drug.

It works by blocking specific proteins that drive tumour growth, particularly in GIST tumours with KIT or PDGFRA mutations.

Because of this targeted mechanism, it tends to affect fewer healthy cells compared to traditional chemotherapy.

Common side effects of imatinib

Most patients tolerate imatinib reasonably well, but some side effects may occur, especially during the early stages of treatment.

Common side effects include:

  • fatigue or reduced energy levels
  • mild nausea
  • fluid retention (particularly around the eyes or ankles)
  • muscle cramps
  • diarrhoea
  • skin rashes

These symptoms are usually mild to moderate and often improve as the body adjusts to the medication.

Less common but important side effects

In some cases, patients may experience less common side effects that require monitoring:

  • changes in liver function
  • low blood counts
  • more significant swelling
  • persistent gastrointestinal symptoms

Regular follow-up helps identify and manage these early.

How are side effects monitored?

Patients taking imatinib are closely monitored by their specialist team.

Monitoring may include:

  • blood tests (to check liver function and blood counts)
  • clinical review of symptoms
  • imaging such as CT scans
  • endoscopic assessments when required

This ensures that treatment remains safe and effective.

How long do side effects last?

For patients taking imatinib after GIST surgery, treatment is often prescribed for up to three years in higher-risk cases.

Side effects may:

  • appear early and improve over time
  • remain mild and stable
  • occasionally require dose adjustment

Most patients are able to continue treatment with appropriate monitoring and support.

Do you need imatinib after GIST surgery?

Not all patients require treatment after tumour removal.

Do I need chemotherapy for GIST? | Imatinib (Glivec) treatment explained

Frequently asked questions

Are side effects from imatinib permanent?

Most side effects are temporary or manageable and improve over time or with dose adjustments.

Do all patients experience side effects?

No. Many patients tolerate imatinib well, with only mild or minimal symptoms.

Can imatinib side effects be controlled?

Yes. Side effects can often be managed through monitoring, supportive treatment, or dose adjustments.

Is imatinib safer than chemotherapy?

Imatinib is generally better tolerated than traditional chemotherapy because it targets specific tumour pathways.

Specialist care and follow-up

Treatment with imatinib should always be managed within a specialist multidisciplinary team, particularly for patients with gastrointestinal stromal tumours.

Ash Rohatgi is a Consultant Upper Gastrointestinal Surgeon in London, working as part of specialist teams managing conditions affecting the stomach and upper digestive system.

Patients benefit from:

  • structured follow-up
  • coordinated care between surgeons and oncologists
  • personalised treatment planning

Find out more Mr Ash Rohatgi

Book an appointment with Mr. Ash Rohatgi, experienced upper gastrointestinal and general surgeon in London! Schedule today!

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