Didn't stop worms after Diphenhydramine in dogs

24 reports to the FDA describe didn't stop worms in dogs given Diphenhydramine. That is 0.5% of all reports for this medicine, compared with 8.4% across reports for all dog medicines, so it is reported less often than average with this medicine.

24Reports

21%Marked serious

17%Recovered

8.3%Died or euthanised

138 daysTypical onset

How soon it started

Same day

0 0.0%

1–2 days

0 0.0%

3–7 days

0 0.0%

1–4 weeks

1 8.3%

Over a month

11 92%

How the animals did

Recovered

4 17%

Still unwell when reported

4 17%

Died

2 8.3%

Not known

14 58%

Problems reported at the same time

Didn't work as expected

8 33%

Diarrhea

4 17%

Vomiting

3 13%

Hair loss

2 8.3%

Anal sac disorder

2 8.3%

Allergic reaction

2 8.3%

Skin rash or irritation

2 8.3%

Drug dose administration interval too short

1 4.2%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Type: medicine.

Questions owners ask

Can Diphenhydramine cause didn't stop worms in dogs?: 24 reports link the two, but a report alone does not prove the medicine was the cause: other illnesses, other medicines or coincidence can be involved. Your vet can judge it for your animal.
How soon after a dose was it reported?: In half of the reports with dates, it started within 138 days of the first dose.
What should I do?: Don't give another dose until you've spoken to your vet, and keep the packaging so you can tell them the product and dose. Your vet can also report it to the FDA (or you can, through the manufacturer or FDA form 1932a).

Didn't stop worms with similar medicines

Didn't stop worms after Melarsomine (Immiticide) 67 reports · 0.3% of its reports
Didn't stop worms after Cefpodoxime 30 reports · 0.7% of its reports
Didn't stop worms after Tramadol 40 reports · 1.1% of its reports
Didn't stop worms after Cephalexin 24 reports · 0.9% of its reports
Didn't stop worms after Chondroitin + Glucosamine 47 reports · 1.8% of its reports
Didn't stop worms after Glucosamine 46 reports · 2.5% of its reports
Didn't stop worms after Enalapril 25 reports · 1.5% of its reports
Didn't stop worms after Phenobarbital 22 reports · 1.4% of its reports
Didn't stop worms after Fish Oil 29 reports · 1.9% of its reports
Didn't stop worms after Sulfadimethoxine 49 reports · 5.3% of its reports

All reported side effects of Diphenhydramine in dogs · Medicines most reported with didn't stop worms