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NexGard SPECTRA® Chewable Tablets for Large Dogs (15kg-30kg)

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  • £24.84 £57.26 Save £32.42 3 Chewable Tablets
SRP £57.26
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NexGard Spectra chewable tablets which are used for treatment of flea and tick infestations, lungworm and intestinal worms in dogs.

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Product Details

This is a prescription item and will be sent once a valid prescription has been received and approved by our vet.

What is NexGard Spectra for Dogs? 

NexGard Spectra for large dogs is a monthly one-tablet treatment meant to treat and protect your dog from a range of both internal and external parasites. These primarily include:

  • Fleas 
  • Ticks
  • Lungworm
  • Roundworm

NexGard Spectra also protects your dog from demodex, sarcoptes, hookworms, whipworm and prevents heartworm. 

How Does NexGard Spectra Work? 

NexGard Spectra for dogs contain two active ingredients: afoxolaner and milbemycin oxime. 

The afoxolaner works by binding to GABA-gated and glutamate-gated chloride channels in insects and their nerve cells. The treatment is then able to attack the parasite's central nervous system, sending them into hyperexcitation which results in uncontrolled activity and death. The milbemycin oxime works in a similar way by disrupting nerve transmissions within the parasite, ultimately leading to their death.

When working together, these two ingredients offer broad-spectrum treatment to protect your dog from both internal and external parasites for a month. 

Please note, NexGard Spectra is available in a range of doses based on your pet’s body weight. Always ensure you are purchasing the correct dosage as stated on your prescription, or we won’t be able to send it to you, resulting in delays to your order. 

NexGard Spectra is also available in the following dosages: 

NexGard Spectra Flea and Worm Treatment 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


NexGard Spectra Chewable Tablets for Large Dogs is available in the following sizes:
  • 3 Tablets


  • Active Ingredient
    Milbemycin Oxime, Afoxolaner

How to Store NexGard Spectra Flea and Worming Treatment for Dogs

Each NexGard Spectra Chew comes individually packaged in a blister pack which should be kept stored in the original box to keep the tablet protected from light.

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

Safety instructions

Do not use Nexgard Spectra in the following animals

  • Puppies less than 8 weeks of age
  • Dogs weighing less than 2kg
  • Animals other than dogs
  • For animals over 8 months living in heartworm endemic areas please consult your vet before using Nexgard 
  • Pregnant, lactating or breeding animals. 

Administration Instructions:

NexGard Spectra flea and worming tablets should be administered orally to your dog. The tablets are chewable and flavoured, making for easy administration. If your dog does not take the chew by itself, it can also be mixed in with your pet’s food.


Q - Can I get NexGard spectra without a vet prescription?

A - No. Nexgard Spectra for dogs can only be purchased with a valid prescription from your vet. Please be wary of anyone offering NexGard Spectra without a veterinary prescription and only buy your pet’s medication from a VMD-accredited retailer. 

Q - Is there a difference between NexGard and NexGard Spectra?

A - NexGard will protect your pet from fleas and other external parasites due to its active ingredient afoxolaner. NexGard Spectra, however, also offers your dog protection from internal parasites and intestinal worms such as lungworm and heartworm due to its second active ingredient, milbemycin oxime.

Please ensure you are ordering the correct NexGard product from us as we can only dispense what your prescription states. 

Q - What are the side effects of NexGard SPECTRA?

A - Side effects in dogs from taking the NexGard Spectra chew are uncommon, but may include vomiting, diarrhoea, lethargy, anorexia, and pruritus (itchy skin). These side effects, however, are generally self-limited and last only a short while. 

In very rare cases, other side effects reported have included erythema and neurological signs (convulsions, ataxia and muscle tremors). If you believe your dog is having an adverse reaction to the NexGard Spectra Chew, contact your vet immediately for further advice. 

Ordering prescription medication is easy

Follow these simple steps

  1. Get a prescription from your vet
  2. Place your order with us
  3. Add a prescription and tell us about your pet
  4. Our vets will double-check your order & once approved, your order will be dispatched within 2 working days.
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