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Abemaciclib Side Effects

The most commonly reported side effects of abemaciclib include diarrhoea, fatigue, and nausea, based on 17,994 FDA adverse event reports from 2014 to 2025. 3.9% of reports found the drug to be ineffective.

Abemaciclib side effects

Percentages show how often each reaction appears relative to total reports for abemaciclib.

1
Diarrhoea29.9%5,386
2
Fatigue11.8%2,127
3
Nausea10.2%1,839
4
Vomiting5.7%1,025
5
Malignant Neoplasm Progression5.5%991
6
Decreased Appetite4.6%835
7
Asthenia4.2%751
8
Death4.2%751
9
Drug Ineffective3.9%701
10
White Blood Cell Count Decreased3.5%624
11
Anaemia3.4%610
12
Constipation3.3%587
13
Neutropenia3.2%572
14
Abdominal Pain Upper3.2%567
15
Alopecia2.8%507

These are voluntary reports and do not establish that abemaciclib caused these reactions.

Report severity

53.1%Serious9,558 reports
22.4%Hospitalizations4,024 reports
7.7%Fatal1,382 reports

Seriousness is determined by the reporter, not by OpenClaim.

Abemaciclib drug interactions

Other drugs that appear in adverse event reports alongside abemaciclib. Drugs flagged as a suspected cause appear in the first column. Drugs taken at the same time but not suspected appear in the second.

Also suspected

1
Letrozole6.5%1,161
2
Fulvestrant4.6%833
3
Anastrozole1.6%282
4
Palbociclib1.4%256
5
Denosumab1.3%232
6
Loperamide-hydrochloride1.2%216
7
Exemestane1.1%194
8
Ribociclib0.9%156
9
Goserelin0.8%148
10
Tamoxifen-citrate0.8%148
11
Zoledronic-acid0.7%120
12
Abiraterone-acetate0.6%110
13
Paclitaxel0.6%108
14
Capecitabine0.6%106
15
Trastuzumab0.5%93

Taken alongside

1
Letrozole7.2%1,295
2
Fulvestrant6.4%1,144
3
Anastrozole3.0%542
4
Ergocalciferol2.6%464
5
Denosumab2.2%402
6
Acetaminophen2.2%399
7
Loperamide-hydrochloride2.2%390
8
Ondansetron1.9%338
9
Levothyroxine-sodium1.9%338
10
Amlodipine1.7%314
11
Omeprazole1.6%287
12
Aspirin1.5%275
13
Exemestane1.4%256
14
Atorvastatin-calcium1.4%249
15
Calcium1.3%225

Co-occurrence in adverse event reports does not establish a drug interaction. Patients often take multiple medications, and these lists reflect prescribing patterns rather than causal relationships. Consult a healthcare provider about potential drug interactions.

Who reports abemaciclib side effects

87.6% of abemaciclib adverse event reports involve female patients and 2.2% involve male patients. The largest age group is adult at 59%. These figures reflect who reports side effects, not underlying risk.

Sex

Female87.6%
Male2.2%
Unknown10.1%

Age group

< 2<0.1%
2–110.2%
12–17<0.1%
18–6459.3%
65+40.4%

What is abemaciclib used for

Conditions and purposes for which patients were taking abemaciclib when the adverse event was reported.

Abdominal Pain UpperAcute Myeloid LeukaemiaAdenocarcinomaAnaemiaAnal CancerAdenocarcinomaAdjuvant TherapyAdverse Drug ReactionAgranulocytosisAlveolar RhabdomyosarcomaAnaemiaAnaemia Of Chronic DiseaseAnaplastic AstrocytomaAplastic AnaemiaAromatase Inhibition Therapy

Showing 15 of 355 indications

Abemaciclib brand names and reporting trend

Abemaciclib is sold under the brand name Abemaciclib.

Brand names

Abemaciclib7,020

Quarterly reports (20142025)

2016202020242025

An upward trend reflects increased FAERS reporting overall, not necessarily increased risk.

Taking abemaciclib with another medication?

Ask OpenClaim about your specific drug combination. Get a sourced report using FDA data, drug labels, and medical literature.