What the label lists and what reports show
Olaparib side effects
Olaparib's FDA label: “Most common adverse reactions (≥10%): • as a single agent were nausea, fatigue (including asthenia), anemia, vomiting, diarrhea, decreased appetite, headache, dysgeusia, cough, neutropenia, dyspnea, dizziness, dyspepsia, leukopenia, and thrombocytopenia.” FAERS holds 20,798 reports naming it through July 30, 2026; the reaction reported most often, leaving out the conditions it is used for, product-use terms and outcomes, is malignant neoplasm progression (2,063 reports).
- No generic listed
Check it at the source: the olaparib FDA label on DailyMed (effective July 10, 2025, AstraZeneca Pharmaceuticals LP); the FDA FAERS public dashboard.
What does the patient leaflet say about side effects?
From the patient leaflet: What is the most important information I should know about Lynparza?Lynparza may cause serious side effects, including: • Bone marrow problems called Myelodysplastic Syndrome (MDS) or Acute Myeloid Leukemia (AML). Some people who have received previous treatment with chemotherapy, radiotherapy or certain other medicines for their cancer have developed MDS or AML during treatment with Lynparza. MDS or AML may lead to death. Symptoms of low blood cell counts are common during treatment with Lynparza, but can be a sign of serious bone marrow problems, including MDS or AML. Symptoms may include: ∘ weakness ∘ weight loss ∘ fever ∘ frequent infections ∘ blood in urine or stool ∘ shortness of breath ∘ feeling very tired ∘ bruising or bleeding more easily Your healthcare provider will do blood tests to check your blood cell counts: ∘ before treatment with Lynparza ∘ every month during treatment with Lynparza ∘ weekly if you have low blood cell counts that last a long time. • Lung problems (Pneumonitis). Lynparza can cause serious lung problems that can lead to death. Tell your healthcare provider if you have any new or worsening symptoms of lung problems, including shortness of breath, fever, cough, or wheezing. Your healthcare provider may do a chest x-ray if you have any of these symptoms. • Blood clots (Venous Thromboembolism, [VTE]). Some people may develop a blood clot in a deep vein, usually in the leg (venous thrombosis), or a clot in the lungs (pulmonary embolism, [PE]) which may be severe or lead to death. Tell your healthcare provider right away if you have any symptoms such as pain or swelling in an extremity, shortness of breath, chest pain, breathing that is more rapid than normal (tachypnea), or heart beats faster than normal (tachycardia). […]
Source: FDA drug label, AstraZeneca Pharmaceuticals LP, effective July 10, 2025 (SPL set 741ff3e3-dc1a-45a6-84e5-2481b27131aa), via openFDA; the full label on DailyMed
What does the label list?
From the label: adverse reactionsMost common adverse reactions (≥10%): • as a single agent were nausea, fatigue (including asthenia), anemia, vomiting, diarrhea, decreased appetite, headache, dysgeusia, cough, neutropenia, dyspnea, dizziness, dyspepsia, leukopenia, and thrombocytopenia.
Table 2 Adverse Reactions Graded according to the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE), version 4.0. in SOLO-1 (≥10% of Patients Who Received Lynparza)
| Reaction | All Grades (%) | Grades 3 – 4 (%) | All Grades (%) | Grades 3 – 4 (%) |
|---|---|---|---|---|
| Nausea | 77 | 1 | 38 | 0 |
| Abdominal pain Includes abdominal pain, abdominal pain lower, abdominal pain upper,… | 45 | 2 | 35 | 1 |
| Vomiting | 40 | 0 | 15 | 1 |
| Diarrhea Includes colitis, diarrhea, and gastroenteritis. | 37 | 3 | 26 | 0 |
| Constipation | 28 | 0 | 19 | 0 |
| Dyspepsia | 17 | 0 | 12 | 0 |
| Stomatitis Includes stomatitis, aphthous ulcer, and mouth ulceration. | 11 | 0 | 2 | 0 |
| Fatigue Includes asthenia, fatigue, lethargy, and malaise. | 67 | 4 | 42 | 2 |
| Anemia | 38 | 21 | 9 | 2 |
| Neutropenia Includes neutropenia and febrile neutropenia. | 17 | 6 | 7 | 3 |
| Leukopenia Includes leukopenia and white blood cell count decreased. | 13 | 3 | 8 | 0 |
| Thrombocytopenia Includes platelet count decreased and thrombocytopenia. | 11 | 1 | 4 | 2 |
| Upper respiratory tract infection/ influenza/nasopharyngitis/bronchitis | 28 | 0 | 23 | 0 |
| UTI Includes urosepsis, urinary tract infection, urinary tract pain, and pyuria. | 13 | 1 | 7 | 0 |
| Dysgeusia | 26 | 0 | 4 | 0 |
| Dizziness | 20 | 0 | 15 | 1 |
| Decreased appetite | 20 | 0 | 10 | 0 |
| Dyspnea Includes dyspnea and dyspnea exertional. | 15 | 0 | 6 | 0 |
Rows and numbers as the label prints them, under its own column headings (the first rows of a longer table where it runs on). A reaction in a trial table is not necessarily caused by the medicine, and trials differ from everyday use.
From the label: adverse reactions, continuedThe following adverse reactions are discussed elsewhere in the labeling: • Myelodysplastic Syndrome/Acute Myeloid Leukemia [see Warnings and Precautions (5.1) ] • Pneumonitis [see Warnings and Precautions (5.2) ] • Venous Thromboembolism [see Warnings and Precautions (5.3) ] • Hepatotoxicity, Including Drug-Induced Liver Injury [see Warnings and Precautions (5.4) ] Most common adverse reactions (≥10%): • as a single agent were nausea, fatigue (including asthenia), anemia, vomiting, diarrhea, decreased appetite, headache, dysgeusia, cough, neutropenia, dyspnea, dizziness, dyspepsia, leukopenia, and thrombocytopenia. (6.1) • in combination with bevacizumab were nausea, fatigue (including asthenia), anemia, lymphopenia, vomiting, diarrhea, neutropenia, leukopenia, urinary tract infection, and headache. ( 6.1 ) • in combination with abiraterone and prednisone or prednisolone were anemia, fatigue, nausea, diarrhea, decreased appetite, lymphopenia, dizziness, and abdominal pain. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact AstraZeneca at 1-800-236-9933 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. …
Source: FDA drug label, AstraZeneca Pharmaceuticals LP, effective July 10, 2025 (SPL set 741ff3e3-dc1a-45a6-84e5-2481b27131aa), via openFDA; the full label on DailyMed
What do FAERS reports show?
20,798 reports list olaparib among the medicines taken, each a report of something that happened, not proof the medicine caused it; 5,936 are coded as a death and 3,825 as a hospital stay. Counts follow how widely a medicine is used and watched, and they are not a measure of how risky it is. Of the 20 reactions below, 14 are named by the same term (in US spelling) in the label's adverse reactions, warnings or patient leaflet; a reaction the label does not name may still be there under another word, and a report does not show that the medicine caused it.
Reports received each year
The 25 most reported reactions
Source: FDA Adverse Event Reporting System (FAERS) via openFDA, reports through July 30, 2026; reactions as MedDRA preferred terms
What next?
- Olaparib: the full record
- label, generics, price, shortages, recalls
- Report a side effect to the FDA
- MedWatch
- Side effects hub
- the most reported medicines and reactions