Sildenafil side effects in dogs

68 reports sent to the FDA between 2012 and 2026 involve Sildenafil in dogs. The most reported problems were loss of appetite, lethargy, kidney problems. 43% were marked serious.

68Reports
43%Marked serious
5.9%Only medicine involved
21%Recovered
16%Died or euthanised
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About this medicine

Type: medicine.

Most reported side effects

Lethargy
15 22%
Kidney problems
11 16%
Breathing problems
11 16%
Vomiting
10 15%
Behaviour change
7 10%
Hyperkalaemia
7 10%
Tremors
6 8.8%
Diarrhea
6 8.8%
Abnormal ultrasound finding
6 8.8%
Proteinuria
5 7.4%
Respiratory distress
5 7.4%
Liver problems
5 7.4%
Abnormal radiograph finding
5 7.4%
Pulmonary hypertension
5 7.4%

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
9 13%
Didn't prevent heartworm
3 4.4%
Didn't stop fleas
2 2.9%
Didn't stop worms
2 2.9%

How soon problems started

Same day
9 20%
1–2 days
6 13%
3–7 days
3 6.5%
1–4 weeks
5 11%
Over a month
23 50%

Time from the first dose to the first sign, where both dates were reported (46 reports).

How the animals did

Recovered
14 21%
Still unwell when reported
19 28%
Died
6 8.8%
Euthanised
5 7.4%
Not known
24 35%

Breeds named most often

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

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