Loratidine side effects in dogs

143 reports sent to the FDA between 2011 and 2025 involve Loratidine in dogs. The most reported problems were vomiting, lethargy, loss of appetite. 23% were marked serious.

143Reports
23%Marked serious
0.0%Only medicine involved
38%Recovered
5.6%Died or euthanised
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About this medicine

Type: medicine.

Most reported side effects

38 27%
Lethargy
19 13%
Loss of appetite
15 10%
Itching
13 9.1%
Diarrhea
11 7.7%
Behaviour change
10 7.0%
Liver problems
9 6.3%
Seizures
7 4.9%
Blood problems
6 4.2%
Fever
5 3.5%
Weight loss
5 3.5%
Overdose
5 3.5%
Allergic reaction
4 2.8%
Wobbliness (ataxia)
4 2.8%
Tremors
4 2.8%

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 stop fleas
6 4.2%
Didn't stop worms
5 3.5%
Didn't prevent heartworm
3 2.1%

How soon problems started

Same day
13 13%
1–2 days
3 3.1%
3–7 days
5 5.2%
1–4 weeks
12 12%
Over a month
64 66%

Time from the first dose to the first sign, where both dates were reported (97 reports).

How the animals did

Recovered
45 31%
Recovered with lasting effects
9 6.3%
Still unwell when reported
55 38%
Died
3 2.1%
Euthanised
5 3.5%
Not known
26 18%

Breeds named most often

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

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