Medical Oncologist
Targeted therapy
Olaparib (Lynparza, Olanib): — The Complete Patient Guide
Olaparib is a tablet taken at home for cancers driven by BRCA mutations or related DNA repair defects. This guide covers what the drug does, who it is for, how to take it safely, and what to watch for.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed August 2026
- Taken at home as a tablet — No infusions or clinic visits for each dose. You take olaparib on a fixed schedule at home.
- Needs a biomarker result first — Your tumour tissue must be tested for BRCA mutation or HRD before olaparib can be prescribed.
- Blood tests are part of safe use — Regular blood count checks are scheduled because low counts are common and need to be caught early.
- Fatigue and nausea are common — Most people notice these, particularly in the first few weeks. Your team can suggest practical adjustments.
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Olaparib is a tablet you take at home on a fixed daily schedule, for cancers where a BRCA gene mutation or a related DNA repair defect is present. It belongs to a class called PARP inhibitors, which block a repair mechanism cancer cells depend on to survive. Your oncologist will have confirmed eligibility by testing your tumour tissue first.
What do the terms on your prescription and test results actually mean?
- PARP inhibitor
- A class of targeted medicines that block an enzyme called PARP, which helps damaged cells repair their DNA. When PARP is blocked in a cancer cell that already has a BRCA mutation, the cell cannot fix the damage and dies. Olaparib is the most widely used PARP inhibitor in India.
- BRCA mutation
- A change in the BRCA1 or BRCA2 gene that reduces the cell's ability to repair certain DNA breaks. Cancers carrying this change are particularly vulnerable to PARP inhibitors. The mutation may be inherited — meaning it runs in the family — or it may have developed only in the tumour itself.
- Maintenance therapy
- Olaparib is often started after chemotherapy has achieved a response, not to shrink the tumour further but to slow or delay its return. This approach — treating after an initial response, to hold the disease at bay — is called maintenance therapy.
- HRD (Homologous Recombination Deficiency)
- A broader category of tumours that have lost the same DNA repair path as BRCA-mutated cancers, even without a BRCA mutation. Some patients without a BRCA mutation are eligible for olaparib if their tumour tests positive for HRD. Your oncologist will have checked for this in your tissue results.
How does olaparib actually work against your cancer?
Cancer cells with a BRCA mutation already have one DNA repair route disabled. Olaparib blocks a second repair route called PARP. With both routes blocked, those cells cannot fix the damage that builds up during normal cell activity and they die.
Normal cells in most people still have a working backup repair route, so they are less affected. This is what distinguishes olaparib from chemotherapy, which affects all rapidly dividing cells more broadly.
The drug only works where that specific vulnerability exists, which is why biomarker testing must come before the prescription. Without the BRCA mutation or HRD, there is no weakness for olaparib to exploit.
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What you need to do while you are taking olaparib
- Take it at the times your team has prescribed, every day, and do not skip doses without speaking to them first.
- Avoid grapefruit and grapefruit juice throughout treatment — it affects how olaparib is processed by your body.
- Tell every doctor, dentist, and pharmacist you see that you are on olaparib before they prescribe or recommend anything new.
- Use effective contraception throughout treatment and for a month after stopping — olaparib can harm a developing baby.
- Keep every scheduled blood count appointment — low counts are common and are monitored so your team can act early.
- Report any new or worsening breathlessness, or a cough that does not go away, to your team the same day.
What side effects do most people notice, and which ones need urgent attention?
Nausea, fatigue, and vomiting are the most common effects, usually most noticeable in the first few weeks. Taking olaparib with food can reduce nausea. These effects often become more manageable as your body adjusts.
Low blood counts — particularly anaemia — are common. You may feel more tired than expected, or short of breath on small exertion. Your blood tests are scheduled to catch this early, which is why keeping those appointments matters.
Two effects are less common but need prompt action on the same day. A sudden fever, chills, or feeling acutely unwell can signal that your white cell count has dropped to a level that raises your infection risk. New breathlessness or a persistent cough can, rarely, signal a lung reaction.
NCCN and ASCO guidance notes an uncommon long-term risk of a blood disorder called myelodysplastic syndrome. Your team monitors for this with the blood tests already part of your follow-up. Knowing it exists helps you understand why monitoring continues even when you feel well.
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- Pazopanib in Kidney Cancer vs Sarcoma: Two Different Treatment Goals
- Pazopanib vs Sunitinib: Comparing Toxicity and Quality of Life
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Drug Deep Dive: Sunitinib (Sutent)
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- Fertility, Pregnancy and Contraception on Sunitinib
- Hand-Foot Skin Reaction on Sunitinib: Prevention From Day One
- How Does Sunitinib Work? The Multi-Kinase Angiogenesis Inhibitor Explained
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- Sunitinib (Sutent, Sunitix): The Complete Patient Guide
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Common questions
Frequently asked questions
Can I take olaparib if my BRCA test came back negative?
Possibly. Eligibility is not limited to BRCA mutations — tumours that test positive for HRD may also respond to olaparib even without a BRCA change. The tissue test your oncologist ordered answers this for your specific cancer. If neither BRCA mutation nor HRD was found, a different treatment will be better suited to you, and your oncologist will have explained why.
How long will I stay on olaparib?
That depends on how your cancer responds and whether you develop side effects that make continuing difficult. When olaparib is used as maintenance therapy after chemotherapy, NCCN guidance supports continuing it until there is evidence of disease progression or unacceptable side effects. Some people take it for several months, others for considerably longer. Your oncologist reviews this at each follow-up visit.
Can I take my usual medicines, supplements, and herbal remedies alongside olaparib?
Some commonly prescribed medicines — including certain antifungals, antibiotics, and medicines for cholesterol or blood pressure — interact with olaparib and change the amount of drug in your bloodstream. Herbal preparations, including those used in Ayurvedic or traditional medicine, can also interact. Tell your oncologist and pharmacist everything you are currently taking, including supplements, before and during treatment, and check before starting anything new.
Is olaparib available as a cheaper generic in India?
Yes. Olanib is a generic version of olaparib available in India at a lower indicative price than the originator brand Lynparza. Both contain the same active ingredient. Cost figures change, so ask your oncologist or hospital pharmacist for the current comparison at your centre. Some manufacturers also offer financial assistance schemes — your treatment coordinator can check whether you are eligible.
What do I do if I miss a dose?
If you remember soon after the missed dose, take it then and continue your usual schedule. If it is close to the time of your next dose, skip the missed one and carry on as usual — do not take a double dose. If you are unsure, contact your team rather than guessing. Missing an occasional dose is less harmful than doubling up.
Will olaparib affect my ability to have children in the future?
Olaparib can harm a developing baby, which is why effective contraception is required throughout treatment and for one month after stopping. The effect on long-term fertility is not fully established by current evidence — we do not yet have complete data on all outcomes. If fertility matters to you, raise it with your oncologist before treatment starts. Options to preserve fertility may exist, but they need to be explored before chemotherapy and olaparib begin, not after.