Synulox Antibiotic for Dogs & Cats

Synulox Antibiotic for Dogs & Cats
50mg Tablets » Priced per Tablet
250mg Tablets » Priced per Tablet
500mg Tablets » Priced per Tablet
RTU Injection 40ml

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  • 50mg Tablets » Priced per Tablet £0.37
  • 250mg Tablets » Priced per Tablet £0.90
  • 500mg Tablets » Priced per Tablet £1.75
  • Palatable Drops » 15ml £12.27
  • RTU Injection 40ml £29.76
  • RTU Injection 100ml £52.80

Selection of 6 products from

£0.37 to £52.80


Synulox is the most commonly used antibiotic for dogs and cats in the UK. It contains amoxycillin and clavulanic acid which act together to provide a safe and effective antibiotic with activity against a wide range of bacteria. The tablets are flavoured to ease administration to dogs and cats and are given twice daily. They will normally be eaten from the hand, or can be crumbled and added to food. Synulox is safe to use during pregnancy and lactation in dogs and cats. Smaller animals can be given Synulox Drops, but they are not suitable for small herbivores such as rabbits and guinea pigs, which can develop serious enteritis following the use of this type of antibiotic.
Synulox LC is supplied in single-use syringes to treat mastitis in milking cows.

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Medication Datasheets

Reviews (11)

Summary of Reviews for Synulox Antibiotic for Dogs & Cats

Overall 5
Ease Of Use
Value For Money
Absence Of Side Effects
11 out of 11 (100%) customers would recommend this product.
5 stars (7 reviews)
4 stars (3 reviews)
3 stars (1 reviews)
2 stars (0 reviews)
1 stars (0 reviews)

Only verified purchasers of this product can leave a review.

55 Infected toe
Verified Purchase

By on 15 June 2021

Seems to have done the job

Customer recommends this product

55 Synulox
Verified Purchase

By on 28 January 2018

Prompt delivery as always & antibiotics made a massive difference

Customer recommends this product

55 synulox antiibiotic
Verified Purchase

By on 20 November 2017

good meds will have again

Customer recommends this product

55 Well prescribed by vets
Verified Purchase

By on 6 November 2017

It works well. It saved the life of my kittens.

Customer recommends this product

45 Fair price, happy with purchase
Verified Purchase

By on 20 June 2017

Good price and happy with the product.
Not easy to get a dog to take them, but it's do-able!

Customer recommends this product

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Q & A

Below are some recent questions we've received regarding Synulox Antibiotic for Dogs & Cats, including answers from our team.

19 July 2021 at 9:46pm


Morgan Phillips

Can my Frenchie take synulox and loxicom together

  • VioVet Staff

Yes these two medicaitons are safe to use together. You should discuss this with your vet though, they are prescription medications and should only be used alongside their advice.

9 June 2021 at 7:22pm

Fatigue and loss of appetite


Will Synolux make a dog sleepy, my dog has had it twice today and been in a really deep sleep both times. Is this normal?

His appetite also disappears for about 4-5 hours after taking the pill

  • VioVet Staff

There are no listed side effects on the datasheet of this product. If your dog has experienced a possible adverse reaction then I recommend you contact the vet who prescribed you the medication, there could be another underlying cause to this.

23 May 2021 at 5:42pm



The vet told me to dose this 12 hours apart but the initial one was given at 11am so I wanted to move the next one to 7.30pm so the following day I can give it at 7.30am before I leave for work , what it the best solution ? Only give half a 50mg tablet at 7.30pm or not give one at all and wait for the one in the morning?

  • VioVet Staff

I recommend discussing this with your prescribing vet firstly, they are aware of what they are treating and whether this is an issue or not. However if wanting to move the 12 hour treatment gap to 7:30am/pm instead then there should be no issues just dosing at 11pm then 7:30am the next day, starting these timings straight away. Synulox is a very safe antibiotic.

30 November 2020 at 1:42pm



Can synulox be used for a bitch when pregnant or ovulating?

  • VioVet Staff

Yes Synulox can be safely used during pregnancy and lactation. It is a prescription only medicine so I strongly advise you only give it following your vet's advice.

25 November 2018 at 8:40pm


Mary Thompson

Can I give this to cats in the food?

  • VioVet Staff


Thank you for your enquiry.

Yes, these can be crumbled and added to food.

Hope that helps,


16 March 2018 at 8:33am

Obsorb Synulox

Helen McLeod

How long does Synulox taken to obsorb in my dogs system, as she is being sick but managing to keep food down for a few hours which include this antibiotic.

  • VioVet Staff

Synulox should be absorbed within an hour so vomiting 2 hours after giving the tablet should not affect the efficacy of the antibiotic.

20 April 2016 at 9:55am

Crystals in cats

Carol M

Does Synalox help with reducing problems with crystals in cat

  • VioVet Staff

In a way it might help indirectly. Synulox is an antibiotic so it kills bacteria in the bladder and helps to eliminate infection. There can be a complex relationship between infection in the bladder and the conditions which encourage crystals to form in the urine, with one encouraging the other. Synulox can certainly help with the overall situation and is often used as part of the treatment, but a change in diet and water intake is also important. (Personally I would always stop all dried food and give wet food only. That includes the prescription diets - dried diets are at best a compromise in treatment, whatever the manufacturer might say. Often these cats are overweight, so a reduction in the total amount of food consumed is also beneficial for them.)

13 September 2015 at 11:48am

How fast until it works


My dogs have kennel cough and I'm using synulox, they've been on it 3 days and no improvement so far. How long should it take to clear them up?

  • VioVet Staff

A lot of different infections are grouped together under the name "Kennel Cough" and in fact many individual cases will involve more than one type of infectious organism. This means that there is a lot of variation and some outbreaks seem to respond well to Synulox whereas some shoe very little response to any type of antibiotic. Many vets do not even prescribe antibiotics for routine cases of kennel cough. Sometimes anti-inflammatories are given to ease any discomfort/distress from the coughing, but often the infection has to run its course just as when you get a bad cold. Viruses often play a part in Kennel Cough and it is the body's immune system which deals with those, Synulox will make no difference.

The usual approach is to do what is needed to help things along, but essentially wait for the dogs' immune systems to deal with the infection. If you are concerned that they are not doing well, it is best to go back to your vet and see if anything more needs to be done.

13 August 2015 at 8:15am

Question of method of administration

Alex Mar

When to take medicine :
Before or after eating and drinking water?
How long ago or how long after eating and drinking water?
It repeated after vomiting and to what period? For example - if vomiting one hour after dosing, is it necessary repetition and in what dose?
(Excuse the mistakes - is used Google translation)

  • VioVet Staff

Synulox is absorbed very well and so it is not important if food is present or not. You can give before food, with food or without food. It is not important. Normally if the patient vomits very soon after taking a dose I would recommend repeating the dose (it is very safe to give a double dose in fact). However if vomiting occurs more than one hour after taking the tablet, I would presume the drug has been absorbed and the vomiting is not important.

25 July 2014 at 1:48pm

Swollen leg due to a wound


Hi my dog recently cut her leg I've been bathing it but this morning the paw looks a little inflamed it's not a big wound but I'm wondering if synulox would be good for this thank you

  • VioVet Staff

Synukox and all other antibiotics are prescription only in the UK so you can only buy some from us if you send us a prescription from your vet. This is because a vet should decide upon examining your dog whether or not antibiotics are appropriate. Very often they are not required, but sometimes they can be very important. Your vet is best able to assess this, much as we would like to help.

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