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Panitumumab Side Effects

The most commonly reported side effects of panitumumab include rash, diarrhoea, and death, based on 14,750 FDA adverse event reports from 2004 to 2025.

Panitumumab side effects

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

1
Rash10.4%1,532
2
Diarrhoea8.7%1,277
3
Death5.6%830
4
Dermatitis Acneiform5.6%821
5
Neutropenia5.5%816
6
Skin Toxicity5.4%803
7
Nausea4.6%683
8
Hypomagnesaemia4.6%676
9
Neuropathy Peripheral4.6%674
10
Disease Progression4.5%663
11
Colorectal Cancer Metastatic4.2%617
12
Off Label Use4.1%608
13
Fatigue3.8%565
14
Thrombocytopenia3.6%527
15
Vomiting3.3%488

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

Report severity

86.8%Serious12,804 reports
34.6%Hospitalizations5,104 reports
16.5%Fatal2,434 reports

Seriousness is determined by the reporter, not by OpenClaim.

Panitumumab drug interactions

Other drugs that appear in adverse event reports alongside panitumumab. 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
Fluorouracil28.6%4,220
2
Oxaliplatin24.6%3,628
3
Irinotecan-hydrochloride17.5%2,579
4
Levoleucovorin10.1%1,488
5
Bevacizumab7.3%1,078
6
Calcium4.6%678
7
Capecitabine3.9%570
8
Leucovorin-calcium2.8%409
9
Cetuximab2.3%344
10
Trametinib1.0%148
11
Cisplatin0.9%138
12
Filgrastim0.8%119
13
Trifluridine0.8%119
14
Dabrafenib-mesylate0.8%112
15
Gemcitabine0.7%108

Taken alongside

1
Fluorouracil13.1%1,931
2
Oxaliplatin11.3%1,674
3
Irinotecan-hydrochloride9.3%1,367
4
Calcium5.4%791
5
Levoleucovorin4.7%692
6
Dexamethasone4.5%671
7
Doxycycline2.9%435
8
Ondansetron2.9%432
9
Capecitabine2.9%421
10
Acetaminophen2.4%351
11
Leucovorin-calcium2.4%350
12
Minocycline-hydrochloride1.9%274
13
Oxycodone1.8%268
14
Loperamide-hydrochloride1.8%266
15
Granisetron1.8%260

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 panitumumab side effects

31.2% of panitumumab adverse event reports involve female patients and 52.1% involve male patients. The largest age group is adult at 50%. These figures reflect who reports side effects, not underlying risk.

Sex

Female31.2%
Male52.1%
Unknown16.7%

Age group

< 20.0%
2–11<0.1%
12–170.1%
18–6450.1%
65+49.7%

What is panitumumab used for

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

Acinar Cell Carcinoma Of PancreasAdenocarcinomaAdenocarcinoma GastricAdenocarcinoma MetastaticAdenocarcinoma Of AppendixAdenocarcinoma Of ColonAdenocarcinoma PancreasAdenoma BenignAnaemiaAnal CancerAnal Cancer MetastaticAnal Cancer RecurrentAnal Squamous Cell CarcinomaAppendix CancerAutoimmune Disorder

Showing 15 of 319 indications

Panitumumab brand names and reporting trend

Panitumumab is sold under the brand name Vectibix.

Brand names

Vectibix8,145

Quarterly reports (20042025)

20042010201520202025

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

Taking panitumumab with another medication?

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