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Targeted therapy

Are EGFR Tablets Like Gefitinib — Actually Chemotherapy?

If you have been prescribed gefitinib and are reading advice written for chemotherapy patients, you are likely reading the wrong advice. Gefitinib is a targeted therapy tablet — a different class of medicine entirely, with different side effects and different precautions.

Medically reviewed by Dr. N. Kiranmayee, Medical Oncologist · Last reviewed September 2026

  • Not chemotherapy — Gefitinib belongs to a different class of cancer medicine. It does not work the way chemotherapy works.
  • Targets one specific fault — It blocks a mutated protein called EGFR found in some lung cancers, and only works if that mutation is present in your tumour.
  • Different side effects — Skin rash and diarrhoea are common on gefitinib. Hair loss and low blood counts are not expected.
  • Wrong advice is a real risk — Applying chemotherapy precautions to a targeted therapy can lead to the wrong decisions about symptoms, diet and daily care.
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Gefitinib is a targeted therapy tablet, not chemotherapy. It works by blocking a specific faulty protein, called EGFR, in your lung cancer cells. Because it works differently from chemotherapy, the side effects are different: skin rash and diarrhoea are common, but hair loss and low blood counts are not.

What do these terms actually mean?

EGFR (epidermal growth factor receptor)
A protein on the surface of cells that tells them to grow. In some lung cancers, the gene that makes this protein carries a specific change — called a mutation — that keeps the growth signal permanently switched on and drives the cancer.
EGFR mutation
A change in the DNA of a lung cancer cell that makes it dependent on a faulty EGFR signal. A biopsy test looks for this mutation. The result is what decides whether EGFR-targeted tablets are a suitable treatment for you.
EGFR inhibitor (targeted therapy)
A medicine that specifically blocks the faulty EGFR signal. Gefitinib, erlotinib, osimertinib and afatinib all work this way. They are a separate class from chemotherapy, with a different mechanism and different side effects.
Chemotherapy
Treatment that works by attacking all rapidly dividing cells in the body. Hair follicles, the gut lining and bone marrow all divide fast — which is why chemotherapy affects them. EGFR inhibitors do not attack cells in this way.
Tyrosine kinase inhibitor (TKI)
The technical name for the class that includes gefitinib. The EGFR protein is a type of enzyme called a tyrosine kinase, and these medicines block it. When your oncologist or pharmacist says TKI, this is what they mean.

Is gefitinib the same as chemotherapy?

No. Gefitinib and chemotherapy are different classes of medicine. They work by different mechanisms, cause different side effects, and require different precautions.

Chemotherapy attacks all rapidly dividing cells throughout the body. That is why it causes hair loss, mouth sores and low blood counts — cells in hair follicles, the gut lining and bone marrow divide fast, and chemotherapy damages them alongside the cancer.

Gefitinib blocks one specific protein: the faulty EGFR signal that your cancer depends on. It is not looking for all dividing cells. Most of what makes chemotherapy side effects predictable simply does not apply.

The side effects you are more likely to notice are a skin rash, diarrhoea, dry or flaking skin, and changes to your nails. These need different management from chemotherapy side effects, and your team will guide you specifically on them.

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How does gefitinib compare with standard chemotherapy?

FeatureStandard chemotherapyEGFR tablet (e.g. gefitinib)
How it worksAttacks all rapidly dividing cellsBlocks a specific faulty protein in your cancer
Hair lossCommonNot expected
Nausea and vomitingCommon with many regimensMild or absent in most people
Effect on blood countsOften significant — immunity is loweredUsually little or no effect
Infection riskRaised, especially around each cycleNot raised in the same way
Skin rashUncommonVery common — tells your team the medicine is active
DiarrhoeaPossible with some regimensCommon, often mild, but needs monitoring
Mouth soresCommonLess common
How it is takenUsually by infusion; some are tabletsDaily tablet, usually at home
Who it works forMany cancer typesOnly cancers with the specific EGFR mutation

What should you know about managing gefitinib day to day?

Does the skin rash mean the medicine is harming me?

The rash associated with EGFR tablets is not a sign of harm — it is a sign that the medicine is reaching the right receptor in your skin as well as in the cancer. It typically appears on the face, scalp, chest and back. Your team can recommend specific creams, and if the rash becomes infected or severe, a short course of antibiotics may be prescribed. The rash rarely means you need to stop the tablet, but do tell your team how it looks and feels at each appointment rather than managing it alone.

Is diarrhoea on gefitinib the same risk as diarrhoea on chemotherapy?

Not quite. On chemotherapy, severe diarrhoea can accompany a dangerously low white cell count — a combination that needs urgent hospital assessment. On gefitinib, diarrhoea is a direct effect on the gut lining and is not usually linked to bone marrow suppression. That does not make it unimportant: diarrhoea that is more than mild, or that continues for more than 24 hours, still needs to be reported to your team the same day. In some people the dose may need to be adjusted, and dehydration can still become a problem.

Do I need to avoid crowds and infections the way chemotherapy patients do?

Your resistance to infection is not affected in the same way on a targeted therapy tablet as it is on standard chemotherapy. You do not need to follow the strict isolation precautions that many chemotherapy patients are given around each cycle. However, if you develop a fever at any point during treatment, call your team the same day — that applies to all cancer treatment, regardless of the class of medicine. When in doubt, call rather than wait.

My prescription says 'oral chemotherapy' — does that mean I am wrong about this?

No. In many hospital and pharmacy systems, 'oral chemotherapy' is a classification category that covers all cancer medicines taken by tablet — including targeted therapies. It is a billing and administrative term, not a description of how the medicine works. Your prescription may carry this label without changing the fact that gefitinib is a targeted therapy with a different mechanism and different side effects from standard chemotherapy. If you are unsure, ask your pharmacist or oncologist to confirm what class of medicine you have been prescribed.

Are erlotinib, osimertinib and afatinib in the same class as gefitinib?

Yes. Erlotinib, osimertinib, afatinib and gefitinib all belong to the same class — EGFR tyrosine kinase inhibitors — and work by the same basic mechanism. They differ in which specific EGFR mutations they target and are referred to as first, second or third generation within this class. Your oncologist will have chosen the one matched to the specific mutation found in your biopsy tissue. What is said on this page about side effects applies broadly to the class, though the exact profile can differ between individual medicines.

Can I take other medicines or supplements alongside gefitinib?

Some medicines and supplements interact with gefitinib in ways that can affect how well it works or make side effects worse. This includes certain antacids, some antibiotics, and herbal or Ayurvedic preparations. Tell your oncologist and pharmacist everything you are taking — including anything bought without a prescription — before making any changes. This is one area where the guidance for targeted therapies can differ from general chemotherapy advice, and your team needs the full picture.

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Common questions

Frequently asked questions

Will I lose my hair on gefitinib?

Hair loss is not an expected side effect of gefitinib or other EGFR-targeted tablets. Hair loss happens with chemotherapy because it attacks rapidly dividing cells, including those in hair follicles. Gefitinib works differently and does not target cells in this way. Some people notice mild thinning, but significant hair loss of the kind associated with chemotherapy is not expected. If you are noticing unexpected hair changes, tell your team at your next appointment — there may be another explanation worth looking into.

Can gefitinib work if I do not have an EGFR mutation?

EGFR-targeted tablets are intended to work in cancers that carry the specific mutation they target. Without that mutation, the cancer is not dependent on the EGFR signal in the same way, and these medicines are unlikely to help. This is why biopsy testing is done before treatment starts. If you are unsure whether your tissue was tested for EGFR mutation, ask your oncologist directly — the answer is usually in your pathology report and you are entitled to understand what it shows.

What should I do if the skin rash becomes very bad?

A mild rash is common and manageable with moisturisers and the skin-care advice your team gives you. If the rash becomes painful, starts to blister, looks infected, or covers a large area of your face or body, call your oncology team the same day rather than waiting for your next scheduled appointment. Do not apply any cream or antibiotic without checking first, as some products can worsen the rash or interact with the treatment. Your team will have a specific plan for managing severe skin reactions on EGFR tablets.

How long will I need to take gefitinib?

Your oncologist decides how long treatment continues based on how your cancer is responding and whether side effects are manageable. EGFR-targeted tablets are usually taken continuously rather than in cycles, which differs from many chemotherapy regimens. Treatment continues as long as the cancer is responding and benefits outweigh side effects. If the cancer changes and stops responding over time, your oncologist will reassess and discuss the next step with you. There is no fixed duration set in advance.

What happens if gefitinib stops working?

Some lung cancers develop changes over time that allow them to grow again despite the medicine — a process called acquired resistance. If this happens, your oncologist will usually arrange a repeat biopsy or a liquid biopsy to find out what has changed in the cancer. Depending on the result, a different EGFR inhibitor, a different class of treatment, or a combination may be an option. We do not yet fully understand how to prevent resistance, but identifying the mechanism when it occurs guides the next decision.

Is EGFR-targeted treatment available at CION?

CION treats lung cancer across its centres in Telangana and Andhra Pradesh, and the decision about which medicine is right for you is made by your treating oncologist based on your biopsy results and overall situation. Targeted therapy, where indicated, is administered as day care. Biomarker testing to establish whether you carry an EGFR mutation is coordinated as part of your work-up. CION does not provide CAR-T or cell therapy; if that is ever discussed for you, you would be referred to a centre that offers it.

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