Same-day dispatch on orders before 3pm UK time
  • Track Order
  • Help & FAQs
  • Contact Us
  • About Us
020 7946 0000
Same-day dispatch before 3pm
Pet Health Supply
Select category
  • Select category
  • Flea, Tick & Worming
    • Cat Dewormers
    • Cat Flea & Tick
    • Cat Heartworm Prevention
    • Chews & Tablets
    • Dog Dewormers
    • Dog Flea & Tick
    • Dog Heartworm Prevention
    • Flea & Tick Collars
    • Flea & Tick Sprays
    • Horse Dewormers
    • Horse Fly Control
    • Household Flea Treatments
    • Natural Flea & Tick
    • Pastes & Liquids
    • Prescription Parasite Control
    • Small Pet Dewormers
    • Small Pet Fleas, Lice & Mites
    • Spot-On Treatments
  • Health & Wellness
    • Bird Healthcare
      • Digestion
      • Louse Control
      • Mite & Parasite Treatments
      • Vitamins & Supplements
    • Cat Healthcare
      • Calming
      • Dental Care
      • Diabetes Care
      • Digestive Health
      • First Aid & Recovery
      • Hairball Remedies
      • Joint & Mobility
      • Kidney & Liver Care
      • Skin & Coat
      • Urinary Health
      • Vitamins & Supplements
    • Dog Healthcare
      • Calming & Anxiety
      • Dental Care
      • Digestive Health
      • Ear & Eye Care
      • First Aid & Wound Care
      • Joint & Mobility
      • Kidney, Liver & Urinary
      • Skin, Coat & Allergy
      • Vitamins & Supplements
    • Horse Healthcare
      • Breeding & Youngstock
      • Hoof Care
      • Horse Calmers
      • Horse First Aid
      • Horse Joint Care
      • Horse Skin & Coat
      • Horse Supplements
    • Small Pet Healthcare
      • Small Pet Vitamins & Supplements
  • Pet Accessories
    • Cat Accessories
      • Cat Beds
      • Cat Bowls & Feeders
      • Cat Collars
      • Cat Doors & Flaps
      • Cat Grooming
      • Cat Litter
      • Cat Toys
      • Catnip
      • Pill Givers & Pill Pockets
      • Stain & Odor Removers
    • Dog Accessories
      • Collars, Leashes & Harnesses
      • Dog Beds
      • Dog Bowls & Feeders
      • Dog Grooming
      • Dog Toys
      • Lick Mats & Slow Feeders
      • Pill Givers
      • Stain & Odor Removers
      • Training Aids
      • Walking & Travel
    • Holiday Gifts
    • Horse Accessories
    • Small Pet Accessories
      • Bedding & Hay
      • Enrichment & Toys
      • Litter & Sand
      • Small Pet Essentials
  • Pet Food
    • Cat Food
      • Breed Specific Cat Food
      • Cat Treats
      • Dry Cat Food
      • Grain Free Cat Food
      • Kitten Food
      • Liquid Food & Milk Replacers
      • Senior Cat Food
      • Veterinary Diet Cat Food
      • Wet Cat Food
    • Dog Food
      • Breed Specific Dog Food
      • Dog Treats
      • Dry Dog Food
      • Grain Free Dog Food
      • Hypoallergenic Dog Food
      • Liquid & Recovery Dog Food
      • Puppy Food
      • Senior Dog Food
      • Veterinary Diet Dog Food
      • Wet Dog Food
    • Small Pet Food
      • Bird Food
        • Caged Bird Food
      • Ferret Food
      • Fish Food
      • Guinea Pig Food
      • Hamster Food
      • Mouse & Rat Food
      • Rabbit Food
      • Small Pet Treats & Chews
  • Prescriptions
    • Bird Prescriptions
    • Cat Prescriptions
    • Dog Prescriptions
    • Horse Prescriptions
    • Small Pet Prescriptions
Login / Register
0 items £0.00
Menu
Pet Health Supply
0 items £0.00
  • Home
  • Prescriptions
    • Shop by Pet
      • Dog Prescriptions
      • Cat Prescriptions
      • Horse Prescriptions
      • Small Pet Prescriptions
      • Bird Prescriptions
      • All prescriptions →
    • Shop by Condition
      • Allergies & Itching
      • Arthritis & Joint Pain
      • Kidney, Liver & Urinary
      • Diabetes
      • Digestive Health
      • Anxiety & Behavior
      • Ear & Eye Care
    • Rx Parasite Control
      • Dog Heartworm Prevention
      • Cat Heartworm Prevention
      • Prescription Flea & Tick
    • Prescription Help
      • How Prescriptions Work
      • Information for Vets
      • Track Your Order
      • Help & FAQs
  • Pet Food
    • Dog Food
      • Dry Dog Food
      • Wet Dog Food
      • Breed Specific
      • Veterinary Diets
      • Hypoallergenic
      • Grain Free
      • Liquid & Recovery
      • Senior Dog Food
      • Puppy Food
      • Dog Treats
      • See all dog food →
    • Cat Food
      • Dry Cat Food
      • Wet Cat Food
      • Breed Specific
      • Veterinary Diets
      • Grain Free
      • Liquid Food & Milk
      • Senior Cat Food
      • Kitten Food
      • Cat Treats
      • See all cat food →
    • Small Pet Food
      • Bird Food
      • Ferret Food
      • Fish Food
      • Guinea Pig Food
      • Hamster Food
      • Mouse & Rat Food
      • Rabbit Food
      • Treats & Chews
      • See all small pet food →
  • Pet Accessories
    • Dog Accessories
      • Dog Toys
      • Grooming
      • Dog Beds
      • Walking & Travel
      • Stain & Odor Removers
      • Training Aids
      • Collars, Leashes & Harnesses
      • Bowls & Feeders
      • Lick Mats & Slow Feeders
      • See all dog accessories →
    • Cat Accessories
      • Cat Litter
      • Cat Collars
      • Bowls & Feeders
      • Stain & Odor Removers
      • Pill Givers & Pill Pockets
      • Cat Doors & Flaps
      • Cat Toys
      • Catnip
      • Cat Beds
      • Cat Grooming
      • See all cat accessories →
    • Small Pet Accessories
      • Bedding & Hay
      • Litter & Sand
      • Essentials
      • Enrichment & Toys
    • More
      • Horse Accessories
      • Holiday Gifts
      • New Arrivals
  • Flea, Tick & Worming
    • Dogs
      • Dog Flea & Tick
      • Dog Heartworm Prevention
      • Dog Dewormers
    • Cats
      • Cat Flea & Tick
      • Cat Heartworm Prevention
      • Cat Dewormers
    • Horses & Small Pets
      • Horse Dewormers
      • Horse Fly Control
      • Small Pet Fleas, Lice & Mites
      • Small Pet Dewormers
    • By Treatment Type
      • Chews & Tablets
      • Spot-On Treatments
      • Flea & Tick Collars
      • Pastes & Liquids
      • Sprays
      • Household Treatments
      • Natural
      • Prescription
      • Shop all parasite control →
  • Health & Wellness
    • Dog Healthcare
      • Joint & Mobility
      • Calming & Anxiety
      • Dental Care
      • Vitamins & Supplements
      • Skin, Coat & Allergy
      • Ear & Eye Care
      • Digestive Health
      • First Aid & Wound Care
      • See all dog healthcare →
    • Cat Healthcare
      • Calming
      • Hairball Remedies
      • Urinary Health
      • Dental Care
      • Vitamins & Supplements
      • Joint & Mobility
      • Skin & Coat
      • See all cat healthcare →
    • Horse Healthcare
      • Calmers
      • Supplements
      • Joint Care
      • Hoof Care
      • Skin & Coat
      • First Aid
      • Breeding & Youngstock
      • See all horse healthcare →
    • Small Pets & Birds
      • Small Pet Healthcare
      • Small Pet Vitamins
      • Bird Healthcare
      • Bird Vitamins
  • Small Pet & Bird
    • Small Pet Food
      • Rabbit Food
      • Hamster Food
      • Guinea Pig Food
      • Mouse & Rat Food
      • Fish Food
      • Ferret Food
      • Treats & Chews
    • Small Pet Healthcare
      • Fleas, Lice & Mites
      • Dewormers
      • Vitamins & Supplements
      • Small Pet Prescriptions
    • Small Pet Accessories
      • Bedding & Hay
      • Litter & Sand
      • Essentials
      • Enrichment & Toys
    • Birds
      • Caged Bird Food
      • Mite & Parasite Treatments
      • Vitamins & Supplements
      • Digestion
      • Louse Control
      • Bird Prescriptions
  • OffersSale
    • Best Sellers
    • New Arrivals
    • Shop by Brand
  • Pet Advice
    • Dog Advice
    • Cat Advice
    • Horse Advice
    • Small Pet Advice
    • Bird Advice
    • How-To Guides
    • All Articles
Onsior Tablets for Dogs 40mg
Onsior Tablets for Dogs – view 2
Onsior Tablets for Dogs – view 3
Onsior Tablets for Dogs – view 4
Click to enlarge
Onsior Tablets for Dogs 40mg
Onsior Tablets for Dogs – view 2
Onsior Tablets for Dogs – view 3
Onsior Tablets for Dogs – view 4
Home Prescriptions Dog Prescriptions Onsior Tablets for Dogs
Zenrelia Film-Coated Tablets for Dogs 8.5mg
Zenrelia Film-Coated Tablets for Dogs £0.77 – £121.99Price range: £0.77 through £121.99
Back to products
Reconcile Chewable Tablets for Dogs 32mg
Reconcile Chewable Tablets for Dogs £0.92 – £73.99Price range: £0.92 through £73.99

Onsior Tablets for Dogs

£0.48 – £33.99Price range: £0.48 through £33.99

Onsior Tablets for Dogs helps with anti-inflammatory and joint & muscle in dogs.

  • Tablet / Capsule
  • Same-day dispatch before 3pm UK time
Clear

Order within 12h 33m for same-day dispatch

  • Free UK delivery over £100
  • Genuine products, authorised supply
  • Secure checkout, every order confirmed by email
  • 30-day returns on unopened items
SKU: N/A Categories: Dog Prescriptions, Prescriptions
Share:
  • Description
  • FAQs
  • Additional information
  • Shipping & Delivery
Description

Onsior Tablets for Dogs at a glance

Onsior Tablets for Dogs is made for dogs and is used for anti-inflammatory and joint & muscle. It comes as tablet / capsule. Compare it with the rest of our dog prescriptions range.

  • Suitable for: Dogs
  • Helps with: Anti-inflammatory, Joint & Muscle
  • Form: Tablet / Capsule
  • Sizes: 5mg · 10mg · 20mg · 40mg

About Onsior Tablets for Dogs

What is Onsior? 

Onsior for dogs is an anti-inflammatory medication meant for the treatment of pain and inflammation associated with chronic osteoarthritis as well as pain and inflammation caused by soft tissue surgery in dogs. One tablet a day has been shown to reduce pain and improve mobility. 

Please note, as Onsior is a prescription medication, we are only able to dispatch the amount of tablets and the dosage stated on your prescription, so be sure to order the correct product in the correct amount to avoid any delays in your order. 

How Does Onsior Work? 

The active ingredient in Onsior for dogs is robenacoxib, meaning it belongs to a class of medications known as non-steroidal anti-inflammatory drugs (NSAIDs). This ingredient blocks an enzyme called cyclooxygenase 2 which is involved in the production of prostaglandins which are involved in pain and inflammation. By blocking the production of this substance, Onsior is able to reduce the pain and inflammation caused by musculoskeletal disorders, surgery or osteoarthritis.

Onsior for dogs is a prescription medication and will only be sent once a valid prescription is received. If you would like advice on how to send your pet’s prescription to us, please read our prescriptions information page. 

Ingredients

Active Ingredient
Robenacoxib

How to use Onsior Tablets for Dogs

How to Store Onsior 40mg for Dogs

All Onsior tablets are sealed in blister pack packaging and have a shelf life of 4 years when unopened. Onsior should be kept out of sight and reach of children and animals and not stored above  25 °C.

Any unused Onsior should be appropriately disposed of either through your vet or at a suitable Disposal Of Old Pharmaceuticals (DOOP) Bin. 

Administration Instructions:

Important Safety Information

Onsior for dogs should not be administered if your dog: 

  • Suffers from gastrointestinal ulceration or has a hepatic disease.
  • Is currently taking corticosteroids or other non-steroidal anti-inflammatory drugs (NSAIDs).
  • Has hypersensitivity to the active substance or to any of the excipients.
  • Is pregnant, lactating or used for breeding. 
  • Weighs less than 2.5 kg or is under 3 months of age.

Onsior 40mg tablets are intended for use in dogs only. If you are looking for similar medication for a cat, we suggest checking the page for Onsior for cats. 

Administering Onsior to your Dog

Onsior tablets for dogs should be administered orally and are palatable to most dogs. 

Onsior should not be given with food as clinical trials have demonstrated better efficacy of robenacoxib for osteoarthritis when administered without food or at least 30 minutes before or after a meal.

Do not break or divide Onsior tablets as this can impact their effectiveness. 

Please note that you should wash your hands after handling Onsior tablets and pregnant women are advised to be particularly careful to avoid dermal exposure. 

FAQs:

Q – What are the side effects of ONSIOR for dogs?

A – Gastrointestinal upset has been commonly reported when dogs are treated with Onsior, however these reactions are mild and generally improve without treatment. These reactions include: 

  • Vomiting 
  • Soft Faeces
  • Decreased appetite 
  • Diarrhoea
  • Blood in faeces

If you think your dog may be having an adverse reaction to taking Onsior, please contact your vet immediately for further advice. 

Q – Is Onsior safe for dogs?

A – While some side effects have been noted when treating dogs with Onsior, these reactions tend to be mild and dogs often recover on their own. If you are concerned about your dog reacting to Onsior, please speak with your vet for further advice. 

For long-term use, your dog’s liver enzymes should be monitored by your vet to ensure it is safe to continue using. 

Some animals are also at a higher risk when using Onsior. Please consult your vet before administering Onsior if your dog has any of the following.

  • Prone to gastrointestinal ulcers
  • Impaired cardiac function
  • Impaired renal function
  • Dehydration, hypotension or hypovolaemia
  • Is already on ACE inhibitors or diuretic medication 

Q – How long does it take Onsior for dogs to work? 

A – Once the dose has been consumed, you should begin to see a relief in your dogs symptoms within 1-2 hours with more clinical improvement to follow over the course of treatment. 

Onsior Tablets for Dogs specifications

Animal Dog
Formulation Tablet / Capsule
Conditions Anti-inflammatory, Joint & Muscle
FAQs

Onsior Tablets for Dogs FAQs

Which pets is Onsior Tablets for Dogs suitable for?

It is made for dogs. Choose the size that matches your pet. Always follow the label and your vet's instructions.

How fast will my order arrive?

Standard UK delivery takes 3–5 working days. Express delivery takes 1–2 business days. See delivery options.

Where can I learn about buying pet medicine safely?

The VMD explains how to buy pet medications safely online.

Additional information
Size

5mg, 10mg, 20mg, 40mg

Pack

30 tablets, Single Tablet

Shipping & Delivery

Related products

Cyclavance Oral Solution for Dogs and Cats 100mg/ml
Cyclavance Oral Solution for Dogs and Cats 100mg/ml – view 2
Quick view

Cyclavance Oral Solution for Dogs and Cats 100mg/ml

£24.99 – £130.99Price range: £24.99 through £130.99
Select options

Cyclavance Oral Solution for Dogs and Cats helps with skin & allergy in dogs.

  • Liquid
  • Same-day dispatch before 3pm UK time
Top searched
BRAVECTO PLUS Spot-On Solution for Medium Cats 250mg (2.8kg-6.25kg)
BRAVECTO PLUS Spot-On Solution for Medium Cats 250mg (2.8kg-6.25kg) – view 2
Quick view

BRAVECTO PLUS Spot-On Solution for Medium Cats 250mg (2.8kg-6.25kg)

£16.99
Add to cart

BRAVECTO PLUS Spot-On Solution for Medium Cats helps with fleas, ticks and worms in cats.

  • Spot On
  • Same-day dispatch before 3pm UK time
Amodip Chewable Tablets for Cats 1.25mg
Quick view

Amodip Chewable Tablets for Cats 1.25mg

£0.89 – £79.99Price range: £0.89 through £79.99
Select options

Amodip Chewable Tablets for Cats helps with hypertension in cats.

  • Chewable Tablets
  • Same-day dispatch before 3pm UK time
Thyronorm Oral Solution for Cats 5mg/ml
Thyronorm Oral Solution for Cats 5mg/ml – view 2
Quick view

Thyronorm Oral Solution for Cats 5mg/ml

£14.99 – £41.99Price range: £14.99 through £41.99
Select options

Thyronorm Oral Solution for Cats helps with hypothyroidism in cats.

  • Liquid
  • Same-day dispatch before 3pm UK time
Sileo Oromucosal Gel for Dogs 0.1mg/ml
Sileo Oromucosal Gel for Dogs 0.1mg/ml – view 2
Quick view

Sileo Oromucosal Gel for Dogs 0.1mg/ml

£19.99
Add to cart

Sileo Oromucosal Gel for Dogs helps with stress & anxiety in dogs.

  • Cream / Gel / Ointment
  • Same-day dispatch before 3pm UK time
Meloxidyl Oral Suspension for Dogs 1.5mg/ml
Meloxidyl Oral Suspension for Dogs 1.5mg/ml – view 2
Quick view

Meloxidyl Oral Suspension for Dogs 1.5mg/ml

£6.99 – £19.99Price range: £6.99 through £19.99
Select options

Meloxidyl Oral Suspension for Dogs helps with anti-inflammatory and joint & muscle in dogs.

  • Liquid
  • Same-day dispatch before 3pm UK time
Loxicom Oral Suspension for Cats 0.5mg/ml
Loxicom Oral Suspension for Cats 0.5mg/ml – view 2
Quick view

Loxicom Oral Suspension for Cats 0.5mg/ml

£5.49 – £6.99Price range: £5.49 through £6.99
Select options

Loxicom Oral Suspension for Cats helps with anti-inflammatory and joint & muscle in cats.

  • Liquid
  • Same-day dispatch before 3pm UK time
Prascend Tablets for Horses 1mg
Quick view

Prascend Tablets for Horses 1mg

£1.09 – £156.99Price range: £1.09 through £156.99
Select options

Prascend Tablets for Horses helps with hormonal in horses.

  • Tablet / Capsule
  • Same-day dispatch before 3pm UK time
Pet Health Supply

Your online pet pharmacy and pet supply store. Pet medicines, parasite prevention, vet diets and everyday essentials, shipped from the United Kingdom.

Shop

  • Prescriptions
  • Flea, Tick & Worming
  • Pet Food
  • Health & Wellness
  • Pet Accessories
  • Deals & Offers
  • Shop by Brand

Orders

  • Track Your Order
  • UK Delivery
  • UK Returns
  • Payment Methods
  • Help & FAQs

Company

  • About Us
  • Pet Advice
  • Contact Us
  • Terms & Conditions
  • Privacy Policy
  • Cookie Policy
  • Accessibility

Customer Service

  • 020 7946 0000
    Mon–Fri, 8am–6pm UK time
  • sales@pethealthsupply.com
  • [Street address]
    [Town/City] [Postcode]
    United Kingdom
© 2026 PetHealthSupply.com. All rights reserved.
  • Home
  • Prescriptions
    • Shop by Pet
      • Dog Prescriptions
      • Cat Prescriptions
      • Horse Prescriptions
      • Small Pet Prescriptions
      • Bird Prescriptions
      • All prescriptions →
    • Shop by Condition
      • Allergies & Itching
      • Arthritis & Joint Pain
      • Kidney, Liver & Urinary
      • Diabetes
      • Digestive Health
      • Anxiety & Behavior
      • Ear & Eye Care
    • Rx Parasite Control
      • Dog Heartworm Prevention
      • Cat Heartworm Prevention
      • Prescription Flea & Tick
    • Prescription Help
      • How Prescriptions Work
      • Information for Vets
      • Track Your Order
      • Help & FAQs
  • Pet Food
    • Dog Food
      • Dry Dog Food
      • Wet Dog Food
      • Breed Specific
      • Veterinary Diets
      • Hypoallergenic
      • Grain Free
      • Liquid & Recovery
      • Senior Dog Food
      • Puppy Food
      • Dog Treats
      • See all dog food →
    • Cat Food
      • Dry Cat Food
      • Wet Cat Food
      • Breed Specific
      • Veterinary Diets
      • Grain Free
      • Liquid Food & Milk
      • Senior Cat Food
      • Kitten Food
      • Cat Treats
      • See all cat food →
    • Small Pet Food
      • Bird Food
      • Ferret Food
      • Fish Food
      • Guinea Pig Food
      • Hamster Food
      • Mouse & Rat Food
      • Rabbit Food
      • Treats & Chews
      • See all small pet food →
  • Pet Accessories
    • Dog Accessories
      • Dog Toys
      • Grooming
      • Dog Beds
      • Walking & Travel
      • Stain & Odor Removers
      • Training Aids
      • Collars, Leashes & Harnesses
      • Bowls & Feeders
      • Lick Mats & Slow Feeders
      • See all dog accessories →
    • Cat Accessories
      • Cat Litter
      • Cat Collars
      • Bowls & Feeders
      • Stain & Odor Removers
      • Pill Givers & Pill Pockets
      • Cat Doors & Flaps
      • Cat Toys
      • Catnip
      • Cat Beds
      • Cat Grooming
      • See all cat accessories →
    • Small Pet Accessories
      • Bedding & Hay
      • Litter & Sand
      • Essentials
      • Enrichment & Toys
    • More
      • Horse Accessories
      • Holiday Gifts
      • New Arrivals
  • Flea, Tick & Worming
    • Dogs
      • Dog Flea & Tick
      • Dog Heartworm Prevention
      • Dog Dewormers
    • Cats
      • Cat Flea & Tick
      • Cat Heartworm Prevention
      • Cat Dewormers
    • Horses & Small Pets
      • Horse Dewormers
      • Horse Fly Control
      • Small Pet Fleas, Lice & Mites
      • Small Pet Dewormers
    • By Treatment Type
      • Chews & Tablets
      • Spot-On Treatments
      • Flea & Tick Collars
      • Pastes & Liquids
      • Sprays
      • Household Treatments
      • Natural
      • Prescription
      • Shop all parasite control →
  • Health & Wellness
    • Dog Healthcare
      • Joint & Mobility
      • Calming & Anxiety
      • Dental Care
      • Vitamins & Supplements
      • Skin, Coat & Allergy
      • Ear & Eye Care
      • Digestive Health
      • First Aid & Wound Care
      • See all dog healthcare →
    • Cat Healthcare
      • Calming
      • Hairball Remedies
      • Urinary Health
      • Dental Care
      • Vitamins & Supplements
      • Joint & Mobility
      • Skin & Coat
      • See all cat healthcare →
    • Horse Healthcare
      • Calmers
      • Supplements
      • Joint Care
      • Hoof Care
      • Skin & Coat
      • First Aid
      • Breeding & Youngstock
      • See all horse healthcare →
    • Small Pets & Birds
      • Small Pet Healthcare
      • Small Pet Vitamins
      • Bird Healthcare
      • Bird Vitamins
  • Small Pet & Bird
    • Small Pet Food
      • Rabbit Food
      • Hamster Food
      • Guinea Pig Food
      • Mouse & Rat Food
      • Fish Food
      • Ferret Food
      • Treats & Chews
    • Small Pet Healthcare
      • Fleas, Lice & Mites
      • Dewormers
      • Vitamins & Supplements
      • Small Pet Prescriptions
    • Small Pet Accessories
      • Bedding & Hay
      • Litter & Sand
      • Essentials
      • Enrichment & Toys
    • Birds
      • Caged Bird Food
      • Mite & Parasite Treatments
      • Vitamins & Supplements
      • Digestion
      • Louse Control
      • Bird Prescriptions
  • OffersSale
    • Best Sellers
    • New Arrivals
    • Shop by Brand
  • Pet Advice
    • Dog Advice
    • Cat Advice
    • Horse Advice
    • Small Pet Advice
    • Bird Advice
    • How-To Guides
    • All Articles
  • Login / Register
Shopping cart
Close
Sign in
Close

Lost your password?

No account yet?

Create an Account
We use cookies to keep your cart working and to improve your experience. By continuing to browse, you agree to our use of cookies.
More info Accept
Onsior Tablets for Dogs 40mg

Onsior Tablets for Dogs

£0.48 – £33.99Price range: £0.48 through £33.99 Select options
Home
Shop
Menu
0 items Cart