Vitamin B Complex side effects in dogs

78 reports sent to the FDA between 2011 and 2026 involve Vitamin B Complex in dogs. The most reported problems were loss of appetite, blood problems, liver problems. 62% were marked serious.

78Reports
62%Marked serious
1.3%Only medicine involved
17%Recovered
37%Died or euthanised
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

About this medicine

Type: medicine.

Most reported side effects

20 26%
Kidney problems
19 24%
Leucocytosis
16 21%
Lethargy
15 19%
Diarrhea
12 15%
Behaviour change
11 14%
Neutrophilia
10 13%
Weakness
9 12%
Hyperphosphataemia
9 12%
Hypoalbuminaemia
9 12%
Hypoglycaemia
9 12%
Seizures
9 12%

Share = percentage of this medicine's reports that mention the problem. One report can list several problems.

Reports that it didn't work

Some reports are about the medicine not working (for example a dog still getting fleas or heartworm), not about a side effect.

Didn't work as expected
17 22%
Didn't stop fleas
5 6.4%
Didn't stop worms
1 1.3%

How soon problems started

Same day
9 13%
1–2 days
18 26%
3–7 days
10 14%
1–4 weeks
12 17%
Over a month
20 29%

Time from the first dose to the first sign, where both dates were reported (69 reports).

How the animals did

Recovered
13 17%
Still unwell when reported
15 19%
Died
18 23%
Euthanised
11 14%
Not known
21 27%

Breeds named most often

Popular breeds appear more often because there are more of them.

Other medicines for dogs