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Pyridoxine Side Effects

The most commonly reported side effects of pyridoxine include nausea, off label use, and vomiting, based on 17,756 FDA adverse event reports from 2004 to 2025. 5.2% of reports found the drug to be ineffective.

Pyridoxine side effects

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

1
Nausea6.2%1,103
2
Off Label Use6.2%1,096
3
Drug Ineffective5.2%920
4
Vomiting5.1%910
5
Diarrhoea4.5%802
6
Flushing4.3%760
7
Fatigue4.2%741
8
Pain3.6%637
9
Abdominal Pain3.6%635
10
Dyspnoea3.5%627
11
Headache3.5%616
12
Pyrexia3.3%590
13
Anaemia3.2%567
14
Constipation3.0%532
15
Weight Decreased3.0%526

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

Report severity

75.9%Serious13,485 reports
42.5%Hospitalizations7,544 reports
12.7%Fatal2,250 reports

Seriousness is determined by the reporter, not by OpenClaim.

Pyridoxine drug interactions

Other drugs that appear in adverse event reports alongside pyridoxine. 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
Isoniazid5.3%946
2
Adalimumab5.1%907
3
Niacin5.0%891
4
Linezolid5.0%884
5
Acetaminophen4.2%751
6
Bedaquiline-fumarate4.1%725
7
Ascorbic-acid4.0%712
8
Pyrazinamide4.0%706
9
Clofazimine3.9%690
10
Teduglutide3.9%690
11
Warfarin3.3%590
12
Folic-acid3.2%572
13
Hydromorphone-hydrochloride3.1%545
14
Cyanocobalamin3.0%530
15
Thiamine2.9%510

Taken alongside

1
Ergocalciferol34.2%6,074
2
Niacinamide33.6%5,973
3
Cyanocobalamin32.6%5,791
4
Folic-acid31.7%5,625
5
Ascorbic-acid29.7%5,271
6
Thiamine28.7%5,092
7
Riboflavin25.8%4,584
8
Biotin25.5%4,531
9
Vitamin-e24.8%4,397
10
Vitamin-a23.9%4,242
11
Dexpanthenol23.9%4,237
12
Aspirin16.5%2,931
13
Acetaminophen15.1%2,682
14
Omeprazole11.3%2,009
15
Tyrosine10.2%1,816

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 pyridoxine side effects

52.3% of pyridoxine adverse event reports involve female patients and 40.2% involve male patients. The largest age group is adult at 55%. These figures reflect who reports side effects, not underlying risk.

Sex

Female52.3%
Male40.2%
Unknown7.5%

Age group

< 24.7%
2–113.9%
12–172.1%
18–6454.8%
65+34.5%

What is pyridoxine used for

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

Abdominal PainAbnormal BehaviourAccidental ExposureAccidental Exposure To ProductAcneAcquired Epileptic AphasiaAcute Graft Versus Host DiseaseAcute Kidney InjuryAcute Lymphocytic LeukaemiaAcute Myeloid LeukaemiaAdenocarcinomaAdjuvant TherapyAdrenal Gland TuberculosisAdverse Drug ReactionAdverse Event

Showing 15 of 554 indications

Pyridoxine brand names and reporting trend

Pyridoxine is sold under brand names including M.v.i.-12 Lyophilized, M.v.i.-12 Adult.

Brand names

M.v.i.-12 Lyophilized13,141
M.v.i.-12 Adult232

Quarterly reports (20042025)

20052010201520202025

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

Taking pyridoxine with another medication?

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