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It overstimulates their central nervous system and heart, causing canine seizures, heart failure, and potentially death. If your dog struggles with kidney or liver problems, giving them Zyrtec could make the problem worse.Jun 4, 2019
Zyrtec (cetirizine) or Claritin (loratadine) can be given once to twice daily. The adult tablets are both 10mg. Dogs under 10 pounds should get no more than 5mg, or ½ of a tablet. Those weighing 10-50 pounds should get 10mg, and heavy dogs (over 50 pounds) can take up to 20mg.Feb 21, 2019
When accidentally ingested by dogs and cats, antihistamine poisoning can result in clinical signs of severe agitation, lethargy, sedation, aggression, abnormal heart rate, abnormal blood pressure, vomiting, diarrhea, inappetance, seizures, respiratory depression, and even death.
Side effects from Zyrtec in dogs are rare, but occasionally some dogs experience:
The most common side effect is lethargy, dry mouth, and urinary retention. Vomiting, diarrhea, and lack of appetite are also possible.
Although Apoquel has 'No known side effects' of seizures all you need to do is go online to see many heartbroken owners who have taken the word of a vet and given their dog this drug, each suffering the same side effect.Apr 24, 2017
Cetirizine does not typically cause any side effects. Vomiting and increased salivation has been observed in some dogs. At high doses, sleepiness has been reported in small dogs and cats. Any side effects that are severe or worsen should be reported to your veterinarian.
Antihistamines for mild pet allergies For example, a person with mild allergies may do well with Claritin. Another person with more severe allergies may do better with Zyrtec. However, Dr. Qamar says that although Zyrtec may be more effective in some patients, “around 10% of people can become sleepy with it.”Sep 17, 2020