So, your thinking can I give my dog antihistamine? Dog allergies are a lot more common than you think, but they don’t always require a trip to the vets and an expensive bill. Below we look at Piriton for dogs, and in particular the correct Piriton dosage for dogs


Are there side effects and is it safe to even use allergy tablets for dogs 

  • Can I give my dog Piriton?
  • Can you give a dog antihistamines?
  • Piriton dose for small dog?
  • Piriton dose for big dog?

You'd be amazed at how many dog owners have asked themselves these questions! 

We all have used this little tablet at some point or another, buts that's us.

What about Piriton for puppies and older dogs?

Well in this article we are not only going to find out.

Dogs Barn dive to see if Piriton tablets are safe for dogs and what dosage is best.

Below we will dive into the pro's and cons of using Piriton, above you can click the link to see prices and read reviews on Amazon.co.uk.

​Let's find out: 

Humans can suffer from numerous allergies. It is estimated that each year, there is an increase in the amount of allergy suffers of 5%. A staggering number, we all must know someone who is stricken by streaming eyes, sneezing fits and a feeling of woe when the pollen count rises in summer.

The symptoms are extremely miserable for the sufferer and, to counteract this, they usually take an antihistamine such as Piriton in either tablet or liquid form to alleviate the symptoms. However, allergies aren’t merely exclusive to humans.

Did you know that dogs can suffer from either mild or severe allergic reactions too?

It can be really uncomfortable for our four-legged friends too which begs the question

Can you use Piriton for dogs?

Dog allergies and how you can help

Some breeds are more susceptible than others to contracting allergies. Although any breed can be affected, Sometimes, it can be an inherited problem and breeds such as Sharpeis, Shihtzus, Bulldogs, West Highland Terriers, Pugs, Boxers and Golden Retrievers are renowned for being pre-disposed to allergic skin conditions.

Symptoms indicating that your dog may have allergies:
  • Increased scratching
  • Red, itchy and inflamed skin
  • Coughing and/or sneezing
  • Incessant chewing of paws
  • Irritated skin around eye or ear 
  • Swelling
  • Hair loss
  • Increased ear infections
allergies and symptoms on dog parts

So, I hear you ask, can I give my dog Piriton?

The short answer is YES you can.

Piriton is perfectly safe for dogs and is often recommended by vets as an alternative to prescription drugs to ease the symptoms of allergies, as long as the correct dosage is adhered to and the tablets or syrup are administered correctly.

Piriton can be used as a long-term solution for uncomfortable, chronic allergy symptoms and has the benefit of having few side effects.

There is no cure for allergic reactions, so the best course of action is to remove the offending allergen from the environment if at all possible. If your faithful friend has a reaction to your cleaning products for example, change them without hesitation. Unfortunately, for dogs suffering from hay fever type symptoms as a result of exposure to grasses and pollens, this can't be avoided.

Dog owners can try to help alleviate some of the irritation by being aware of the causes and finding ways to offer some relief. This is where Piriton Tablets can help.

piriton packaging

What is Piriton?

Piriton contains chlorphenamine, which is a sedating anti-histamine. Histamine is produced naturally in the body, but, when humans or dogs suffer from an allergy, large amounts of histamine are produced in an oversensitive reaction to a particular substance.

The reason behind this effect results from the immune system working overtime and that produces the irritating conditions associated with allergies.

Chlorphenamine works by blocking this reaction, reducing the risk of symptoms developing initially and relieving the itchiness associated with the condition.

chlorpheniramine is a drug

Dog Piriton Side Effects

There are few side effects with this drug but watch out for the following:


Because Piriton contains a sedating anti-histamine, your dog can appear drowsy so it’s important to ensure the dosage is absolutely correct, especially with smaller breeds of dogs.


As with any medication given to your dog, there is the chance that their body reacts in a different manner which can affect their bowel movements. Constipation is usually more common than diarrhoea in the case of Piriton, but that can differ. Any problems should sort themselves out after a couple of days, but, if the condition persists, make an appointment to see, or telephone your vet.

Dry Mouth

If your dog is drinking more than usual or smacking his lips, he is probably suffering from dry mouth (not producing enough saliva) which can be another side effect of using Piriton. Always ensure your dog has a plentiful supply of fresh water to satisfy any increased thirst. You could also try moistening dry food with stock or feeding bits of ice throughout the day to keep the mouth moist.


Some dogs can experience nausea when using anti-histamines. This is usually only an initial reaction and quickly resolves itself but it can lead to loss of appetite or inability to keep food down. If this problem persists, stop using the drug and seek veterinary advice.

Changes in Behaviour

Most dogs suffering from an allergic reaction will be uncomfortable and may exhibit changes in behaviour becoming more aggressive or lethargic. 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.

Piriton for Dogs: The Correct Dosage and How Often?

Piriton, used as an allergy remedy for your pet, is available in both tablet and liquid form. It is important to check with your vet not only in order to administer the correct dosage but also to check their will be no negative reactions with other medications.



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This is important with Piriton. The tablets usually come in 4mg which is equivalent to 10ml of the syrup. Proper dosage depends on a number of different factors including the size, weight and breed of your dog and the severity of the reaction. but in general, 1/2 a 4mg tablet or 5ml is prescribed for smaller breeds, while 1-2 tablets or 10-20ml of liquid can be administered to larger dogs.

This dose can be given up to three times daily if required. While Piriton tablets for dogs can be used in the long term, it is advisable to use only until the condition clears up or, in the case of seasonal allergies, as long as is needed.

"Ouch that Stings"

Piriton tablets are especially useful if your pet suffers from an allergic reaction to an insect bite. Some dogs seem to love chasing, and even eating wasps and bees in the summer, which can result in some nasty bites and stings.

While most only produce a mild annoyance to the animal, some can cause a severe allergic reaction. Common signs to look for include redness and irritation around the bite or sudden swelling of the face, muzzle or mouth.

Piriton can provide almost instant relief in these situations and it is always a good idea to keep some handy in the summer months for emergencies.

piriton tablets image

Fleas, you want rid of these fast!

The most common cause of an allergic reaction in Dogs is flea bites it is the saliva they inject into the dog that causes the reaction with the skin becoming itchy and inflamed. The more the dog scratches only increases the problem and can result in hair loss and infection.

 The more the dog scratches only increases the problem and can result in hair loss and infection. 

It is especially important to keep fleas under control with regular treatments for dogs that suffer from allergies. If they do succumb to the odd bite Piriton Tablets or liquid can ease the irritation before it causes further problems.

dog parts ticks hide infographic

Where to buy?

How to Give Piriton to your Dog?


Can you buy piriton over the counter?

How long does it take for piriton to work?

Is chlorpheniramine safe for dogs?

Chlorpheniramine side effects?

Can a dog overdose on Piriton?

Can you use human Piriton for dogs?

Dog Hayfever, can I give Piriton?

Is it safe to give dogs Piriton when they're on other meds?

Can I give a dog human anti-histamines?


Watching your beloved dog suffer with the uncomfortable itching and soreness of allergies is heart-breaking and for many the symptoms only get worse as they become older.

Piriton for dogs can be safely used to relieve the discomfort and irritation of allergy symptoms without breaking the bank.

Furthermore, there is the added bonus of the antihistamine having little or no side effects. That said, before using any medication on your dog, it is essential that you consult with your vet first.

If the condition doesn't improve or becomes worse, seek medical attention immediately.

John Devlin

Owner - Dogsbarn.com


Husband, father and avid dog lover. Currently the proud owner of George a pedigree Golden Retriever that barely leaves my side. However, cute this sounds a little break from the dog hairs every now and then would be nice!

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Alec Bell

Dennis my Westie is now 10 years old and started developing bad skin problems. A lot of cash spent at the Vets has not cured the problem so now he is on Piriton, 3 x 2mg per day. I can’t say it is curing the problem but probably keeping it under some control. The cause is a mystery and is not a food allergy, it also can’t be pollen at this time of the year!


Try using hibi scrub brilliant for my dog I bath him in it once a month and use along side the Pirton he was on steroids before and he was putting on to much weight and wasn’t him now he has the above he is a different dog. U can also use the hibi scrub to bath just certain areas works wonders it’s about fiver on ebay highly recommend it.

Lynne Gibbons
We have a little Staffie rescue dog. Rosie, who is about 4 years old, came to us from kennels in December. She is mainly white with a large tan heart on her side (cute!) She has dark patchy skin markings under her coat but is quite pink around the face area. However in the last month she has started shedding her already, very thin coat in handfuls. Its not been that warm! She is fed ‘Step Up to Naturals Adult Light Sensitive’ with a little raw chicken mince.Today,when she had her annual injection, we asked our vets opinion as to… Read more »
Jan donovan

Arthur my 9 month goldie. Rolls around in dried bracken
Then suffers sore eyes a bit of a discharged not smelly. And itchy paws for days after. Have been giving him piriton 3 times a day. A good rake through his coat when we get home. I wipe his eyes with ice cold boiled water. Any other ideas be great. Keeping away from the bracken not possible as live in the new forest

Elizabeth figgett

I have a 7 month old golden retriever red skin on belly can he have priton how much he is 23kg


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