Diphenhydramine side effects in Shih Tzus

130 FDA reports involve Diphenhydramine in a Shih Tzu. These are the problems they describe.

Vomiting
50 38%
Lethargy
31 24%
Loss of appetite
30 23%
Didn't work as expected
22 17%
Death
19 15%
Diarrhea
18 14%
Itching
16 12%
Breathing problems
14 11%
Liver problems
14 11%
Seizures
13 10%
Swelling
13 10%
Didn't stop fleas
11 8.5%

All reports for Diphenhydramine in dogs