Generally, one tablet a day is safe for dogs to take, but the amount can vary greatly depending on your dog's size and symptoms.
In humans, pseudoephedrine helps with congestion, but in pets, it overstimulates the central nervous system and the heart, resulting in potentially life-threatening seizures and heart failure. Therefore, Zyrtec-D is considered to be toxic to dogs.
Zyrtec Dosage and Instructions. It is recommended to give your dog 0.5mg per pound of body weight. You can safely give Zyrtec to your dog up to 20 mg per day.
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.
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.
When you can't live without your pet, a medicine for dog and cat allergies can help control your pet allergy symptoms. ZYRTEC® starts working at hour 1 and stays strong day after day, so you can reduce your cat and dog allergy symptoms.
Tolerance is not a problem. Rarely, they can cause acute self-limited liver injury. One study has reported a more serious long-term effect, a 3.5-fold increase in the risk of gliomas, a common type of brain tumor in patients with long-term antihistamine use for allergic conditions.
Yes, Claritin can be safe and effective for dogs. Vets recommend that you give your dog approximately 0.1 to 0.5 milligram/pound of body weight once to twice daily.
The dosing schedule is also much more convenient, with dogs weighing over 10 lbs getting a single 10mg tablet once daily. Dogs weighing less than 10 lbs can have half of a 10mg tablet once daily. Chlortrimeton is another excellent antihistamine for dogs, and is the drug of choice for kitty allergies as well.
Oral prescription allergy medicine for dogs
For oral prescription allergy medicine, both vets we spoke to recommended Apoquel. Apoquel is an oral tablet you can give your dog daily for his allergy symptoms.
If your dog is prescribed antihistamines you will need to try them for 2-3 weeks to see if it helps. If it doesn't, you'll need to stop giving it to your dog and try another until you find one that works, following the advice of your vet.
Zyrtec improves dog allergy symptoms such as itchy skin, runny noses, and watery eyes. Drowsiness is a common side effect of Zyrtec.
Apoquel is associated with more side effects than Zyrtec or CBD – some of them quite serious. Zyrtec and CBD alone or combined are likely safer for your dog if they successfully control your pet's itching and inflammation.
Antihistamines. Diphenhydramine (Benadryl®), cetirizine (Zyrtec®), and loratadine (Claritin®) are commonly used antihistamines that relieve allergy symptoms or counteract allergic reactions. Antihistamines are usually safe but can make some dogs drowsy and others hyperactive.
Benadryl is a great medication for use in dogs with mild-to-moderate allergies. Seasonal allergies, food allergies, environmental allergies, and allergic reactions to snake and insect bites all respond to Benadryl in most cases.
Cetirizine (Zyrtec) ¼ - ½ mg per pound (one 10mg tab per 30-40 lbs) twice daily.
Quercetin: A Natural Antihistamine For Dogs
Are you looking for a natural anti-histamine for dog allergies? Quercetin is a bioflavonoid that acts as an antihistamine for dogs and has antioxidant and anti-inflammatory properties. Many veterinarians suggest Benadryl or Apoquel for allergies in dogs.
The most common antihistamine for dogs is diphenhydramine (brand name Benadryl). Also found in ProSense Dog Itch & Allergy Solutions Tablets, diphenhydramine is safe in most dogs if given in the recommended dosage of 1 mg of diphenhydramine per pound of body weight given by mouth.
Yes, you can take cetirizine (Zyrtec) only when you need it if you have allergy symptoms once in a while. But if you have allergy symptoms on a daily basis, taking it regularly according to the manufacturer's directions might give you the most relief from your allergies.
Zyrtec and Claritin have very few side effects and are generally recognized as safe for most people. However, some side effects may still occur. Zyrtec can cause sleepiness, but only in some people. Take it for the first time when you will be at home for a few hours in case it makes you sleepy.
The American Academy of Otolaryngology-Head and Neck Surgery (AAO-HNS) currently recommends those using antihistamines for allergies to take them every day — instead of only when symptoms flare up — to maximize their benefits.
Cetirizine (Zyrtec® or Reactine®) is one of the most commonly used over-the-counter antihistamines recommended by veterinarians. Claritin® can be used but is not typically recommended by veterinarians as some forms of Claritin® contain decongestants such as pseudoephedrine which is very toxic to dogs.
You may be wondering whether Claritin or Zyrtec is the best pet allergy medicine—but which antihistamine works best for you depends on the severity of your symptoms. For example, a person with a mild allergy to cats or dogs may do well with Claritin. Another person with more severe allergies may do better with Zyrtec.
Antihistamines like Benadryl and Zyrtec
ANTI-histamines, such as diphenhydramine (Benadryl®), certirizine (Zyrtec®), and hydroxyzine, are commonly taken by humans to treat allergy symptoms and can be used for dogs as well. These medications work by preventing histamine from binding to cells and exerting its effects.
Apoquel is not FDA approved to use twice daily longer than 14 days. The dose range is very strict, I do not recommend going above the recommended dose due to immune suppression, below the range and it doesn't seem to work in most cases.