Piriton, the popular antihistamine, is commonly used by humans as a form of allergy relief. But is it safe for dogs suffering with allergies, too?
Not sure whether Piriton is safe for dogs? From dose, to the common side effects, we speak to the experts to find out everything you need to know...
Can you give your dog Piriton?
Anna Threlfall, a medicine specialist at Davies Veterinary Specialists, tells Country Living: "I think the safest thing to say is that chlorphenamine (Piriton) can be administered to dogs, but this should be done under the direction of a veterinary surgeon.
"If you are concerned that your dog might have an allergy, please speak to your vet for advice. There are several different antihistamines used in dogs for a variety of different conditions. They are generally safe, but should only be used as directed."
Some of the symptoms of allergies in dogs include:
- Increased scratching
- Red, itchy and inflamed skin
- Coughing and/or sneezing
- Incessant chewing of paws
- Irritated skin around eyes or ears
- Hair loss
- Frequent ear infections
When should I give my dog Piriton?
You should not give your dog Piriton unless you have consulted your vet and they have given specific advice surrounding your dog's needs. You should consult your vet if your dog is suffering from an allergic reaction and displaying any of the symptoms listed above.
A vet will know the correct cause of action for a dog with allergies.
Can pharmacists legally sell Piriton if they know it is for an animal?
No, pharmacists can't legally sell Piriton if they know it is for an animal. If someone wishes to give their animal Piriton it will have to be obtained from the vets or via a veterinary prescription — you cannot buy this over-the-counter.
Regardless of its safety in dogs, this is a human medicine and not one that is licensed for use in animals. Therefore, pharmacies have to refuse sale of Piriton if they are aware that it is for animal use.
For a human medicine to be used in an animal it has to be prescribed by a vet under the 'cascade system.' This means that a human medicine can only be supplied against a veterinary prescription if there is not a licensed animal product already available for that specific problem.
Anna tells us: "Some allergy medication, such as chlorphenamine (Piriton), can be administered to dogs. The indications and doses are, however, variable and therefore the medication should only be administered under the direction of your veterinary surgeon.
"If you are concerned that your dog has an allergy that might benefit from such medication, please seek veterinary advice. If chlorphenamine (Piriton) is deemed appropriate, you can purchase this from your vets or request a prescription so this can be purchased from a human pharmacy under the direction of a veterinary surgeon."
How much Piriton should you give a dog?
According to expert advice, the proper dosage depends on a number of different factors. In general, 1/2 a 4mg tablet is prescribed for smaller breeds, while 1-2 tablets can be given to larger dogs. Your vet will consider factors such as the size and weight of your dog and whether they have other illnesses.
How long does Piriton take to work in dogs?
Piriton begins to act within a few hours, and you should notice some improvement in your dogs symptoms within 24 hours. Mild drowsiness may occur, but you should contact your vet about pronounced or concerning changes.
Are there any side effects of Piriton for dogs?
1. Drowsiness: Piriton is an antihistamine, so it can make your dogs drowsy in the same way it does humans.
2. Diarrhoea: Dogs react differently to different medications, so you may find that Piriton causes an upset stomach. If this continues, it's advised you book an appointment with your vet.
3. Dry mouth: Another side effect you may spot is your dog having a dry mouth. If this is the case, ensure your dog has plenty of fresh water to drink throughout the day.
4. Nausea/vomiting: Often, dogs will vomit as an initial reaction to something. If this persists, stop giving the tablets to your dog and seek advice from a vet.
5. Changes in behaviour: You may notice a change in your dog's behaviour. Again, this should also pass but if you are worried it's advised you seek professional advice from your vet.
Can Piriton be dangerous for some dogs?
Piriton may not be suitable for every dog, which is why it should only be given on a vet’s advice. Extra caution may be needed for dogs that have medical conditions such as glaucoma, heart disease and high blood pressure.
Piriton can also interact with other medicines, including sedatives and other drugs that depress the central nervous system. Always tell your vet about any prescription medicines, over-the-counter products, vitamins or supplements your dog is taking before giving them Piriton.
Does Piriton work for all dog allergies?
No, Piriton does not work for every dog or every type of allergy. Antihistamines can sometimes help prevent or control mild itching, but their effectiveness in dogs is variable and they are often less useful once severe itching or inflammation has developed. They may also do little to help when symptoms are being driven by fleas, food allergies, skin infections or another underlying condition.
10 dog breeds most likely to suffer from hay fever
Some dogs are more likely to suffer from hay fever than others due to their exposure to pollen when they were young, the shape of their nose, their coats and their surroundings. Read our full article on dogs and hay fever here.
- Pit Bull Terrier
- Bichon Frise
- Boxer
- Cocker Spaniel
- German Shepherd
- Golden Retriever
- Dalmatians
- Irish setters
- Schnauzers
- West Highland terriers
What alternatives to Piriton can vets prescribe?
The best alternative will depend on what is causing your dog’s symptoms and how severe they are. A vet may recommend another antihistamine for mild itching or prescribe treatments such as corticosteroids to control inflammation and itching.
Other options can include medicated shampoos and topical treatments, strict flea prevention or a veterinary elimination diet. Allergy management is often multimodal, meaning that several treatments and preventive measures are used together rather than relying on a single medicine.
What is Piriton?
Piriton is an allergy tablet, licensed for human use only, which contains the active ingredient chlorphenamine maleate. Piriton is used to help control symptoms caused by allergic conditions, such as hay fever, hives, food allergies, and insect bites.
The tablets can be purchased in a range of British supermarkets, for humans only.
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Lisa Joyner is the Deputy Daily Editor at House Beautiful UK and Country Living UK, where she's busy writing about home and interiors, gardening, dog breeds, pets, health and wellbeing, countryside news, small space inspiration, and the hottest properties on the market. Previously, she has written for Conde Nast Traveller, House & Garden and Marie Claire magazine. Lisa studied at University For The Creative Arts, where she completed a BA in Fashion Journalism.
