Biosimilar Cancer Drugs in India — What They Are and How They Differ
If a biosimilar appears on your prescription, it is natural to want to understand what it is. This page explains what a biosimilar is, how it differs from a generic, and what it must prove before CDSCO approves it for use in India.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026
- Not a generic — A biosimilar is not a chemically identical copy. It is a highly similar version of a complex biological medicine.
- CDSCO-approved — Every biosimilar used in India must pass review by CDSCO before it can be prescribed.
- Used in cancer care — Biosimilars exist for several biological medicines used in cancer — including monoclonal antibodies and growth factors.
- Made to a standard — A biosimilar must show no clinically meaningful differences in safety or effect compared with the original.
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A biosimilar is a biological cancer medicine that is highly similar to an already-approved original — called the reference product. It is not the same as a generic drug. CDSCO, India's medicines regulator, reviews and approves biosimilars before they can be prescribed. They are available for several classes of biological cancer treatment in India.
How is a biosimilar different from a generic drug?
| Feature | Generic Drug | Biosimilar |
|---|---|---|
| How it is made | Chemical synthesis in a laboratory | Manufactured using living cells — bacteria, yeast, or mammalian |
| Identical to the original? | Yes — exact same molecule | Highly similar, not identical — small differences are expected and permitted |
| Regulatory review in India | Abbreviated process — proves same molecule | Requires clinical evidence — proves no meaningful difference in safety or effect |
| Approved in India by | CDSCO | CDSCO |
| Typically used for | Small-molecule chemotherapy agents | Biological medicines: monoclonal antibodies, growth factors |
| Price vs original | Usually significantly lower | Lower than the reference product, though the difference varies |
What do these words on your prescription mean?
- Biological medicine (biologic)
- A medicine made using living cells rather than chemical synthesis. Because it is made from living systems, it is a large, complex molecule — far more complex than a chemotherapy tablet.
- Reference product
- The original approved biological medicine that a biosimilar is compared against. Also called the originator or innovator product.
- Biosimilar
- A biological medicine shown to be highly similar to its reference product, with no clinically meaningful differences in safety, purity, or potency. It must pass CDSCO review before it can be used in India.
- Monoclonal antibody
- A class of biological medicine that targets a specific protein on cancer cells or in the immune system. Several monoclonal antibodies used in cancer care have approved biosimilars in India.
- Growth factor (G-CSF)
- A biological medicine that stimulates white blood cell production after chemotherapy. Growth factor biosimilars are among the most commonly used in cancer support care in India.
- CDSCO
- The Central Drugs Standard Control Organisation — India's national medicines regulatory authority, which reviews and approves all drugs, including biosimilars, before they can be prescribed.
Are biosimilars approved the same way as other medicines in India?
No — biosimilars go through a more demanding review than generic drugs, because the medicine is more complex. CDSCO requires clinical data showing the biosimilar has no meaningful difference in safety or effect compared with its reference product.
This is not a paper exercise. It involves laboratory comparisons of the molecule and clinical studies in patients. CDSCO formalised this pathway in guidelines first published in 2012.
If a biosimilar is being used in your treatment, it has passed that review. It is not an unregulated copy of the original.
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What should you ask before receiving a biosimilar?
- Ask your oncologist for the name of the medicine — both the generic name and the brand being dispensed.
- Ask which original reference product this biosimilar is based on.
- Tell your team about any past reactions to any biological medicine, including infusion reactions.
- Do not switch brands on your own — always tell your oncologist if a different brand is dispensed.
- Keep a note of the brand name and batch number you receive at each visit.
- Ask what to watch for after your infusion — the monitoring needs are the same as for the reference product.
Does using a biosimilar mean a lower standard of care?
No. CDSCO approval requires evidence of no clinically meaningful differences from the original. A biosimilar that reaches you has met that standard.
Biosimilars make the same class of treatment available at a lower cost. That matters for access in India, where some original biological medicines carry very high list prices.
If you have a concern about switching from one product to another, raise it directly with your oncologist. That conversation is always reasonable to ask for.
Did you know?
India established a dedicated regulatory pathway for biosimilars in 2012 through CDSCO guidelines — one of the earliest such frameworks in Asia.
Several cancer biosimilars manufactured in India are also approved for use in other countries under their own regulatory systems.
Source: CDSCO Guidelines on Similar Biologics, 2012
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Frequently asked questions
What exactly is a biosimilar?
A biosimilar is a biological medicine — made from living cells — that has been shown to be highly similar to an already-approved original, called the reference product. It is not chemically identical, because biological medicines are too large and complex for that. What it must demonstrate is that any differences between it and the original do not meaningfully affect safety or how the medicine works. CDSCO reviews and approves that evidence before the biosimilar can be used in India.
Is a biosimilar the same as a generic drug?
No. A generic drug is chemically identical to its original — the same molecule, made the same way. A biosimilar is made from living cells and is highly similar but not identical, because no two batches of a biological medicine are ever perfectly identical, even the original. Because of this complexity, biosimilars require more extensive regulatory review than generics, and cannot be substituted as automatically as a generic would be.
Are biosimilars approved and legal to use in India?
Yes. CDSCO has a defined approval pathway for biosimilars, first formalised in 2012. A biosimilar must submit clinical evidence of similarity to its reference product and receive CDSCO approval before it can be marketed or prescribed. If a biosimilar appears on your prescription or is administered at a registered clinic in India, it has gone through that process.
Are biosimilars as safe as the original biological medicine?
CDSCO approval requires evidence that there are no clinically meaningful differences in safety from the original. Biosimilars do not receive approval on the assumption that they are safe — they are required to prove it. Any biological medicine, whether original or biosimilar, carries the possibility of infusion reactions and other effects that your clinical team will monitor for. The monitoring approach is the same for both.
Why are biosimilars cheaper than the original?
The company making a biosimilar does not carry the research and development costs of discovering the original medicine. It still has to invest in manufacturing and the regulatory studies required for approval, but those costs are lower. That difference is passed on, at least in part, as a lower price. For some cancer biologics that carry very high original list prices, biosimilars can make treatment meaningfully more accessible.
Can my oncologist switch me to a biosimilar without telling me?
Your oncologist should explain any change to the medicine you are receiving. Switching — from a reference product to a biosimilar, or from one biosimilar to another — is a clinical decision that should involve you. If a different brand appears on your prescription or is dispensed without explanation, ask directly. It is reasonable to understand exactly what you are being given, and your team should be able to explain it.
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