Are you wondering “can I give my dog Piriton?” Well the good news is Piriton for dogs is safe.

However, as with all medications you should consult your vet for the correct dosage of Piriton for dogs as well as any side effects of Piriton when treating hay fever.

Veterinary advice on if you should give your dog Piriton will also cover the size, weight and breed of your dog as well as well as any potential allergic reaction you may encounter with Piriton tablets for dogs.

Piriton is a popular antihistamine for dogs that can help relieve allergic reactions such as hayfever, insect bites and more. These afflictions can cause your dog a lot of distress, making them irritable, anxious and badly behaved. Plus, no one likes to see their companion facing such hardship.

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Can I Give My Dog Piriton?

If your dog is suffering from hay fever, insect bites or a different allergic reaction then ask a vet first to make sure Piriton is safe and in what dosage you can give your dog Piriton.

Piriton is generally safe but seek veterinary advice for the correct dosage – usually three times daily – as well as any Piriton side effects to look out for.

How Much Piriton Can I Give My Dog?

A small dog weighing under 9kg (20lbs) can take 1/2 a Piriton tablet. Larger dogs weighing more than 9kg can take between 1 to 2 tablets which is a maximum dose of 8mg.

The tablets contain a dose of 2mg per dog, or 2mg for under-weighed dogs to take at least 8mg – a dose is between 2mg and 8mg for a larger dog.

Piritons are available in Europe and Australia and can help the owners of small pups and small dogs with rashes and hives.

What is Piriton?

Piriton is a sedating anti-histamine that is used for allergic reactions in humans and pets. The active ingredient in Piriton tablets, Chlorphenamine, blocks the reaction to a particular substance, such as food allergies, and reduces the risk of symptoms developing and relieving the itchiness associated with the condition.

Piriton is available in a range of British supermarkets, for humans only, and contains chlorphenamine maleate, which is the active ingredient of the antihistamine used by humans and dogs. It is used to help control symptoms such as allergies such as hay fever, hives, food allergies and insect bites.

Piriton Dose For Dogs

Piriton dose range from 0.2mg up to 0.4mg per kilo of the dog’s body weight. The dose should be repeated every 8 to 12 hours to achieve maximum results. The tablets (the same as 10ml of the liquid version) usually come in 4mg doses.

A 1/2 tablet dose is about right for smaller breeds and 1-2 tablets should suffice for larger breeds. It’s important to monitor your dog’s condition and only administer the pills when needed.

Does Piriton Cause Side Effects in Dogs?

Piriton can cause some side effects in dogs, including vomiting and dry mouth.

If you are giving your pet too much the tablets could be cause for concern. Drowsiness can occur in dogs just like it can in humans, but should you seek advice from a vet.

Diarrhoea can occur due to an upset stomach from the medicine. A change in behaviour can occur but is uncommon, if you notice anything significant, then seek some medical attention, and try to incorporate it into a meal.

Common Side Effects of Giving Your Dog Piriton


One of Piriton’s ingredients is a sedating antihistamine, which can make your dog feel sleepy. You should ensure the dosage is set correctly because Piriton can produce irregular effects on smaller breeds.


Side effects of Piriton can manifest in your dog in a few ways. Usually, they are seen as constipation or diarrhea, but there is a chance the body reacts differently and with varying severity. If any symptoms persist with your dog for more than two days after being administered, consult your veterinarian immediately.

Dry Mouth

Piriton may cause your dog to have a dry mouth, which can increase your dog’s thirst. Always ensure your dog has a plentiful supply of fresh water to keep the mouth moist during this phase. To address any other side effects of Piriton, enhance their food with stock or feed them ice cubes throughout the day.


Your dog might experience nausea when using anti-histamines. This can either be a temporary symptom or require veterinary help to resolve.

Changes in Behaviour

It is important to note that most dogs suffering from an allergic reaction will usually be uncomfortable and may exhibit changes in behavior. Once you start using Piriton tablets, if these changes continue or become worse it is a good idea to consult your vet as there may be another underlying problem.

Can you give your dog Piriton?

Chlorphenamine (Piriton) can be administered to dogs, but this should be done by a vet or under guidance by a vet.

Some of the symptoms that may show if your dog has allergies include: allergy symptoms including: nausea, dryness, vomiting, fatigue, depression, anxiety, depression and anxiety.

Is Piriton Safe for Dogs?

The active ingredient in Piriton can be dangerous if it interacts with other drugs taken by your dog.

Dogs can have adverse reactions to medication just like we do. According to, there are 320 drugs which can interact with chlorpheniramine.

The first point of call should be to check with your vet if you want to give your dog Pirito to help them with any of its effects. You should only give the medication on the advice of your vet before taking it on any kind of dose.

How many 4mg Piriton Can I give my dog?

In general, 1/2 a 4mg tablet or 5ml is prescribed for smaller breeds, while 1-2 tablets or 10-20 ml can be given to larger dogs.

Which antihistamines are safe for dogs?

Antihistamines including Benadryl®, Zyrtec®, and Claritin® are often used to take care of or counteract the effects of allergies.

Antihistamines are usually safe , but they can make dogs drowsy or hyperactive. Medications over-the-counter may contain ingredients that cannot be used with pet medication.

When purchasing an antihistamine for dogs, read the label carefully to make sure that it only contains antihistamine. Check with your veterinary healthcare team to confirm that the product is suitable for your dog.

Is Piriteze the same as Piriton?

One key difference between piriton and piriteze allergy tablets is their active ingredients. Piriton has the active ingredient chlorphenamine while Piriteze contains cetirizine hydrochloride as its active ingredient.

Cetirizine hydrochloride is generally not as safe for your pet, so it’s best to play it safe and give them Piriton if the vet recommends it.

Both tablets work to relieve symptoms by blocking the effect of histamine, a chemical released when you come into contact with allergens. Antihistamines will help reduce allergy symptoms because they block the effects of histamine.

Can pharmacists legally sell Piriton if they know it is for an animal?

No, pharmacists cannot legally sell Piriton to an individual if they know the drug will be used on an animal. If someone wants to administer Piriton to their pet, they must either obtain it from a veterinarian or have written permission in the form of a prescription from said veterinarian.


To conclude, Piriton is a prescription drug for humans that can also be used on animals to relieve the symptoms of hay fever.

It works by blocking histamine and should not be sold in pharmacies for dogs unless they have obtained permission from a veterinarian. If you believe your pet might need this medicine, it’s best to play safe and get expert advice.

Don’t forget that allergies are not the only affliction your sog may encounter. Our pet insurance can help with a wide range of potential injuries and illnesses your dog may face over time. Vet fees can be very high with more complex treatments being invented all the time. That means your dog has a better chance of a long life than ever before, so make sure you have the financial means to support that.