1800 202 8726
How chemotherapy reaches the brain

Intrathecal Chemotherapy: — What Happens and What It Feels Like

Intrathecal chemotherapy is not a drip and not a tablet. It is an injection into the fluid surrounding your brain and spinal cord, placed where standard treatment cannot reach. The procedure is more straightforward than it sounds.

Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026

  • Not a drip — It goes directly into the spinal fluid space, not into a vein.
  • Why it is needed — The blood-brain barrier stops most standard chemotherapy from reaching the brain and spinal cord.
  • Local anaesthetic is used — The procedure should not be painful. You feel a brief sting for the anaesthetic, then numbness.
  • Day care, not an admission — Most people go home the same day after a rest period at the centre.
4.8 · 800+ Google reviews · 15,000+ patients treated
Limited Slots Today

Talk to a medical oncologist

₹950   Today: FREE  ·  Including free written second opinion

Reply within 2 working hours
Reviewed by a senior medical oncologist
Confidential. No commitment to start treatment.
or
Call 1800 202 8726
17+
Cancer Specialists
on Panel
96.9%
Breast Cancer
Survival Rate*
15,000+
Patients
Treated
4.8★
Google Rating
(800+ reviews)

Intrathecal chemotherapy is injected directly into the fluid surrounding your brain and spinal cord. Standard chemotherapy given by drip or tablet cannot cross the blood-brain barrier, leaving cancer cells there unreachable. This injection bypasses that barrier. Local anaesthetic is used, so the procedure causes little pain.

How is intrathecal chemotherapy given, step by step?

  1. You are positioned

    You lie on your side with knees drawn up toward your chest, or sit hunched forward over a pillow. Both positions open the spaces between the vertebrae in your lower back.

  2. Your back is cleaned

    The skin over your lower back is cleaned with antiseptic. A sterile drape is placed around the injection site.

  3. Local anaesthetic is given

    A small injection of local anaesthetic numbs the skin and tissue beneath. You feel a brief sting, then the area goes numb. The rest of the procedure happens in numb tissue.

  4. The needle is guided in

    A thin needle is passed between two vertebrae in your lower back into the space where spinal fluid circulates. You may feel pressure, but not sharp pain.

  5. Spinal fluid may be withdrawn

    A small amount of spinal fluid is sometimes taken first for laboratory testing. This is routine and takes only a moment.

  6. The drug is injected

    The chemotherapy is injected slowly into the spinal fluid. This takes a few minutes. You stay as still as possible throughout.

  7. You rest afterward

    The needle is removed and a small dressing is placed. You lie flat for a period at the centre before going home. This reduces the risk of a headache afterward.

Why can't a drip or tablet reach cancer in the brain?

Your brain and spinal cord are protected by the blood-brain barrier — a dense layer of cells lining blood vessels that tightly controls what passes from the bloodstream into the brain.

This barrier is usually protective. It also means most standard chemotherapy drugs, whether given by drip or by mouth, cannot reach the spinal fluid in amounts that work.

Cancer cells that have spread to the fluid around the brain and spinal cord are hidden behind this barrier where a drip cannot follow. Injecting the drug directly into that fluid bypasses the barrier entirely.

Is the injection painful, and what should you expect afterward?

The local anaesthetic is the sharpest part. You feel a brief sting when it is injected, then the skin and deeper tissue go numb.

During the procedure, you may feel pressure or a strange sensation. If anything feels sharp, say so immediately — more anaesthetic can be given.

A headache that develops after you sit or stand up is the most common side effect. Lying flat and drinking fluids helps. If it is severe or does not improve, tell your team.

Not sure what this means for you?

Share your reports and a senior oncologist will explain your options in plain language — no obligation to start treatment.

Meet the Specialists

17+ senior cancer specialists. One panel for your case.

Trained at AIIMS, Tata Memorial, and leading international centres. Combined 150+ years of experience. Every complex case is reviewed by 3+ of them — together.

Dr. Naresh Gundu
Medical Oncologist

Dr. Naresh Gundu

MBBS, DNB (Internal Medicine), DM (Medical Oncology)

View Profile
Dr. C. Raghavendra Reddy
Medical Oncologist

Dr. C. Raghavendra Reddy

MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)

View Profile
Dr. Bharati Devi Gorantla
Medical Oncologist

Dr. Bharati Devi Gorantla

MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)

View Profile
Dr. Owais Mohammed
Medical Oncologist

Dr. Owais Mohammed

MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)

View Profile
Dr. T. Raghavender Reddy
Medical Oncologist

Dr. T. Raghavender Reddy

MBBS, DM (Medical Oncology), MD (Radiation Oncology)

View Profile
Dr. N. Kiranmayee
Medical Oncologist

Dr. N. Kiranmayee

MBBS, DM (Medical Oncology), MD (Internal Medicine)

View Profile
Dr. Muralidhar Muddusetty
Surgical Oncologist

Dr. Muralidhar Muddusetty

MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)

View Profile
Dr. Raghavendra Naik
Surgical Oncologist

Dr. Raghavendra Naik

MBBS, MS (General Surgery), M.Ch (Surgical Oncology)

View Profile
Dr. Mohammed  Imaduddin
Surgical Oncologist

Dr. Mohammed Imaduddin

M.B.B.S, MS (General Surgery), M.Ch (Surgical Oncology)

View Profile
Dr. Vinay Mamidala
Surgical Oncologist

Dr. Vinay Mamidala

MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)

View Profile
Dr. Paila Gowri Naidu
Surgical Oncologist

Dr. Paila Gowri Naidu

MBBS, MS (General Surgery), M.Ch (Surgical Oncology), FMAS

View Profile
Dr. Venkata Sushma P
Radiation Oncologist

Dr. Venkata Sushma P

MBBS, MD (Radiation Oncology)

View Profile
Dr. Kirti Ranjan Mohanty
Radiation Oncologist

Dr. Kirti Ranjan Mohanty

MBBS, MD (Radiation Oncology)

View Profile
Dr. Gangadhar Vajrala
Radiation Oncologist

Dr. Gangadhar Vajrala

MBBS, MD (Radiation Oncology), MPH

View Profile
Dr. Basudev Pokhrel
Hematologist

Dr. Basudev Pokhrel

MBBS, M.D (Immunohematology & Blood Transfusion)

View Profile
Dr. Mohammed Imran
Interventional Radiologist

Dr. Mohammed Imran

View Profile
Dr. Vajja Sandeep Kumar
Surgical Oncologist

Dr. Vajja Sandeep Kumar

MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology

View Profile
Dr. Sridhar Kamani
Surgical Oncologist

Dr. Sridhar Kamani

MBBS, MS (General Surgery), DrNB (Surgical Oncology)

View Profile

Want a specific doctor for your case? Mention them when booking.

Book Free Consultation

You do not have to work this out alone

A 45-minute consultation with a specialist who treats this every week.

Book Free Consultation Call 1800 202 8726

What happens at the centre on the day?

Intrathecal chemotherapy is given as a day procedure at CION centres. You do not need to be admitted overnight.

Before the procedure, your team confirms your blood results, checks your medicines, and answers any questions you have. A trained doctor performs the injection.

You rest at the centre afterward. Most people go home the same day. Your team will tell you what to watch for and who to call if anything concerns you.

What do most people worry about before this procedure?

Could the needle damage my spinal cord?

In adults, the spinal cord ends around the first or second lumbar vertebra. The injection is made below that level, where only nerve roots float freely in fluid. The needle does not reach the cord itself. This is the same anatomical principle that makes epidurals safe during childbirth, and the position is confirmed by the doctor before the needle advances.

Is this the same as the spinal injection given before surgery?

The technique is the same — a needle through the lower back into the spinal fluid space with local anaesthetic applied first. The purpose is different. A surgical spinal block numbs the lower body for an operation. An intrathecal chemotherapy injection places drug into the fluid that bathes the brain and spinal cord. Both use the same lumbar landmark.

Which medicines are given this way?

The drugs most commonly used intrathecally include methotrexate and cytarabine. Your oncologist will tell you which specific drug you are receiving and what role it plays in your treatment plan. Do not start, stop or change any medicine without discussing it with your treating team first.

What side effects can this cause beyond a headache?

Some people feel tired for a day after the procedure. The chemotherapy given this way can, in a proportion of patients, cause temporary neurological effects. Tell your team promptly if you notice any change in your vision, speech, limb strength or thinking in the days following the injection. These are not common, but they are important to report early.

Can children have this procedure?

Yes. Intrathecal chemotherapy is a standard part of treatment for childhood leukaemia. Younger children are usually given sedation or a short general anaesthetic so they remain still and comfortable throughout. Your child's oncology team will explain exactly what is planned and how they will keep your child calm and comfortable on the day.

Did you know?

Before intrathecal treatment became part of standard leukaemia protocols, the brain and spinal fluid were a common site of relapse even when disease elsewhere had responded well.

Adding direct CNS-directed chemotherapy substantially changed this. The blood-brain barrier is the reason this route exists and why it remains in standard care worldwide.

Source: NCCN Guidelines for Acute Lymphoblastic Leukemia

Explore 82 more How Chemotherapy Is Given: Regimens, Cycles & Infusion Days topics

HUB — Chemotherapy Regimens

HUB — Cycles, Schedules and What Happens on Infusion Day

All How Chemotherapy Is Given: Regimens, Cycles & Infusion Days →

Next step

Still not sure what applies to you?

Send your reports across and a senior medical oncologist will go through what they mean, what is known, and what the options actually are.

Book Free Consultation Call 1800 202 8726
Common questions

Frequently asked questions

What conditions is intrathecal chemotherapy used for?

It is most commonly used in leukaemia and some lymphomas, where cancer cells can reach the fluid around the brain and spinal cord. It is also used when cancer has spread from elsewhere to the lining of those structures — called leptomeningeal metastasis. Your oncologist will explain whether it is being given to prevent CNS involvement or to treat disease already there.

How long will the whole visit take?

The injection itself takes only a few minutes. The full visit — preparation, the procedure, and the rest period at the centre afterward — typically takes a few hours. Plan for a half-day. This can vary if spinal fluid is also being taken for testing on the same day.

Can I eat and drink before the procedure?

For most adults, eating and drinking normally beforehand is fine, because the procedure does not require general anaesthesia. If sedation is planned — which is more common for younger children — your team will give you specific fasting instructions. Follow what your team tells you rather than assuming.

Do I need someone to bring me home?

Yes. You should have someone with you for the journey home and for the rest of that day. A post-procedure headache, the position required, and the general effect of the day make driving yourself home unsafe. If you have no one available, tell your team before the procedure day so they can help you plan.

How soon can I return to normal activities?

Most people return to light activities within a day or two. If you develop a post-procedure headache, rest helps more than pushing through it. Avoid strenuous activity until you feel well. Your team will advise on anything specific to your situation.

What should I tell my team before the procedure?

Tell your team about every medicine you take, including herbal remedies and supplements. Mention any allergies, especially to local anaesthetics. If you take blood-thinning medicines including aspirin, ask whether to pause them beforehand. If you have had back surgery or significant spine problems, mention this before the day — it may affect the technique used.

Full index

Browse all 579 chemotherapy topics

Every page in this section, grouped by the part of treatment it belongs to. Open a group to see what is in it.

Before You Start: Tests, Ports & Fertility42
Blood Counts, Infection, Fever & Emergencies73

Anaemia & Low Haemoglobin

HUB — Low Blood Counts, Infection and Fever During Chemotherapy

Chemotherapy and Supportive Medicines by Name75

Chemotherapy Drugs by Name

HUB — Chemotherapy Drugs by Name

HUB — Generic, Branded and Biosimilar Chemotherapy in India

HUB — Supportive Medicines Used With Chemotherapy

Chemotherapy at CION Cancer Clinics1
Chemotherapy by Cancer Type and Special Situations5

Special Populations & Comorbidities

HUB — Chemotherapy in Special Situations

Chemotherapy in Hyderabad: Cost, Centres & Access93

HUB — Choosing a Chemotherapy Centre and Safe Administration

Common Side Effects and How They Are Managed78
Food, Diet, Hydration & Household Safety6
How Chemotherapy Is Given: Regimens, Cycles & Infusion Days85

Other Ways Chemotherapy Is Given

HUB — Cycles, Schedules and What Happens on Infusion Day

Is It Working, Finishing Chemotherapy & Survivorship7

Is It Working? Response & Scans

HUB — Is Chemotherapy Working? Scans and Response

HUB — When Chemotherapy Stops Working

Nerve, Skin, Heart, Kidney and Cognitive Effects5

Skin, Nails & Hand-Foot Syndrome

Heart, Lung & Organ Toxicity

HUB — Effects on the Heart, Kidneys, Liver and Nerves

Understanding Chemotherapy, Myths & Trials97

HUB — Chemotherapy Myths and Alternative Treatment Claims

HUB — Clinical Trials in Cancer Treatment

HUB — What Is Chemotherapy and Why Has It Been Advised?

Work, Family, Relationships and Emotional Support12
Call now Book free consultation