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Injection routes

Subcutaneous and Intramuscular — Chemotherapy Injections

Some chemotherapy medicines are given as a small injection under the skin or into a muscle rather than as a drip. The visit is often shorter. A trained nurse gives the injection at the clinic.

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 — Some medicines are designed for injection into fatty tissue or muscle, not a vein.
  • Shorter clinic visits — An injection that replaces a multi-hour infusion can reduce your clinic time to minutes.
  • Done by trained staff — Every injection is given by a nurse at the clinic. This is not a home procedure.
  • A brief sting is expected — The site may sting or feel warm for a short time. Spreading redness or growing pain needs reporting.
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Subcutaneous chemotherapy is injected into the fatty tissue just under the skin using a short fine needle, usually placed into the belly or thigh. The injection takes a few minutes rather than the hours a drip requires. A trained nurse gives every dose at the clinic — this is not a home injection.

How is a subcutaneous or intramuscular injection given?

For a subcutaneous injection, the nurse inserts a short fine needle into the fatty layer just under the skin. The belly, front of the thigh, and outer upper arm are common sites. The medicine is pushed in slowly over a minute or two.

An intramuscular injection goes deeper, into the muscle rather than the fatty layer. The thigh and upper arm are typical sites. The two routes are not interchangeable for the same medicine — your oncologist prescribes which type your treatment requires.

Examples of medicines given this way include bortezomib (also known by the brand name Velcade), azacitidine (Vidaza), and subcutaneous formulations of rituximab and trastuzumab. Your oncologist prescribes both the medicine and the route. You do not choose between injection and drip for the same drug.

What happens at your injection appointment?

  • Wear loose clothing or clothing with easy access to your belly and thighs.
  • Tell the nurse if the previous injection site is still tender or has not fully healed.
  • The nurse will rotate between sites to allow each area time to recover.
  • Expect a brief sting when the needle goes in. Some medicines cause a burning sensation as they are injected — this is normal.
  • Stay in the clinic for a short observation period after the injection before leaving.
  • You can travel home independently unless your team has told you otherwise.

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Is the injection faster, and does it hurt more than a drip?

For medicines that come in both an intravenous and a subcutaneous form, the injection visit is substantially shorter. Where a drip takes an hour or more in the chair, an injection takes minutes.

The injection site may sting briefly and feel mildly firm or red for a day or two afterwards. This is different from the discomfort of a cannula in your arm, not necessarily worse.

What you feel depends partly on the medicine. Tell the nurse before you start if you are anxious, and tell them afterwards if the reaction is bigger or more painful than last time.

What do patients most often ask about injection chemotherapy?

Why is my medicine given as an injection when I expected a drip?

Some medicines have been developed in two formulations — one for a vein and one for under the skin. The subcutaneous form typically uses an enzyme called hyaluronidase to allow a larger volume to absorb through the fatty tissue. Your oncologist will have prescribed whichever form is appropriate for your treatment plan. Being offered the injection form is not a different or lesser treatment; it is a different delivery route for the same active medicine.

What is the difference between a subcutaneous and an intramuscular injection?

A subcutaneous injection goes into the fatty tissue just under the skin, which absorbs the medicine slowly and steadily. An intramuscular injection goes into the muscle, which has a richer blood supply and absorbs more quickly. Your nurse will confirm which type your prescription specifies. The two routes are designed for different medicines and are not swapped based on preference or convenience.

What site reactions are normal and what needs reporting?

Mild redness, a small firm lump, or slight bruising at the injection site in the first day or two is common and usually settles on its own. Spreading redness beyond the injection site, significant pain that does not ease, a lump that grows rather than shrinks, or warmth and swelling that worsens all need prompt reporting. Call your oncology team the same day if any of these develop rather than waiting for your next appointment.

Does the injection form of a medicine work the same as the drip form?

Subcutaneous formulations go through regulatory review to confirm that the amount of medicine reaching the bloodstream is equivalent to the intravenous form. Regulatory bodies including the European Medicines Agency require this equivalence data before approving a subcutaneous formulation. If a subcutaneous form is recommended for you, it has met that standard. Ask your oncologist to explain the data behind the choice if you would like to understand it in more detail.

Can the injection be given at home?

No. Chemotherapy injections are always given in a clinical setting by trained staff, regardless of how short the procedure is. The medicine must be prepared and handled safely, the injection site must be assessed at each visit, and any reaction needs to be managed without delay. The brevity of the injection does not make it a home procedure, and no reputable oncology service should offer chemotherapy injections outside a supervised clinical environment.

Did you know?

The subcutaneous formulation of rituximab takes approximately five minutes to administer. The intravenous form of the same medicine typically requires 90 minutes or more at the first dose.

Shorter clinic time is the main practical benefit for patients who are eligible for the injection form.

Source: European Medicines Agency, MabThera SC (rituximab) Assessment Report

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Common questions

Frequently asked questions

Which chemotherapy medicines can be given as a subcutaneous or intramuscular injection?

A small number of chemotherapy and biological medicines have approved injection formulations. Examples include bortezomib, azacitidine, and subcutaneous formulations of rituximab and trastuzumab. Pegaspargase is typically given by intramuscular injection. The list is growing as manufacturers develop injection versions of medicines previously given only as drips. Whether you are eligible for the injection form depends on your cancer type, stage, and the treatment plan your oncologist recommends — it is not a choice you make independently.

Why does the nurse keep moving where the injection goes each visit?

Using the same site repeatedly does not allow the tissue time to recover and can lead to a buildup of hardened fatty tissue that absorbs the medicine poorly. Rotating between sites — right belly one visit, left thigh the next — keeps each area healthy and ensures the medicine absorbs consistently. Tell your nurse where the last injection was given if they do not ask, and point out any site that has not fully healed.

My doctor suggested the injection form of my medicine. Should I be concerned it is a lesser treatment?

No. Where an injection formulation exists for a medicine, regulators require evidence that it delivers an equivalent amount to the intravenous form before approving it. Being offered the injection form means it has cleared that standard. It is a different delivery route, not a downgrade. If you would like to understand the specific reason your team chose this form for you, ask your oncologist — a clear explanation is entirely reasonable to expect.

There is a small hard lump where I had my last injection. Is this normal?

A small, firm area under the skin that is shrinking over a few days after an injection is common and usually resolves on its own. Tell your nurse at your next visit so they can check and record it. If the lump is growing, is very painful, feels hot, or the skin around it is becoming red and spreading, call your oncology team the same day rather than waiting. Infection at an injection site is uncommon but needs prompt attention.

What should I watch for in the hours after leaving the clinic?

Mild soreness and slight redness at the injection site for a day or two is expected. Call your team the same day if you develop a rash elsewhere on your body, difficulty breathing, a racing heart, or feel faint after the clinic. These can be signs of an allergic or immune reaction. If any of these develop in the hours after your injection, contact your oncology team or go to the nearest emergency department — do not wait.

Is injection chemotherapy available at CION?

Yes. Subcutaneous and intramuscular chemotherapy is given as day care at CION centres across Telangana and Andhra Pradesh. The clinic visit for an injection is typically much shorter than for an intravenous infusion. If your treatment plan includes injection-form chemotherapy, ask your care coordinator which centre location is most convenient for your schedule.

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