Selection of 14 products from
£16.00 to £68.50
This product is sourced in the United Kingdom and is intended for use in the United Kindgom only.
Stronghold provides one of the most complete parasite treatments available in one easy spot-on application. The contents of one pipette are emptied onto the skin of the back of the neck once a month. The active ingredient is absorbed through the skin and for 1 month it will kill fleas, lice, worms and mites wherever they are, either inside, or on the surface of, the body. In areas where heartworm is found, Stronghold prevents this too, which is important for dogs and cats traveling to Europe on the Pet Travel Scheme.
For a full explanation of the parasite control provided by Stronghold, read the relevant datasheet by clicking on the individual products below.
A colourless to yellow ready to use solution of selamectin. Stronghold is presented in a single use plastic tube for cutaneous (spot-on) administration to dogs and cats. Each tube contains:
Stronghold 15 mg:
0.25 ml 6% selamectin
Stronghold 30 mg:
0.25 ml 12% selamectin
Stronghold 45 mg:
0.75 ml 6% selamectin
Stronghold 60 mg:
0.5 ml 12% selamectin
Stronghold 120 mg:
1 ml 12% selamectin
Stronghold 240 mg:
2 ml 12% selamectin respectively.
For the treatment and prevention of flea infestations caused by Ctenocephalides spp. for one month following a single administration. This is as a result of the adulticidal, larvicidal and ovicidal properties. Stronghold is also ovicidal for 3 weeks after administration.
For use as part of a treatment strategy for flea allergy dermatitis and through its ovicidal and larvicidal action may aid in the control of existing environmental flea infestations in areas to which the animal has access.
For the treatment of ear mites (Otodectes cynotis).
For the prevention of heartworm disease caused by Dirofilaria immitis with monthly administration.
For the treatment of adult intestinal roundworms (Toxocara canis) in dogs. For the treatment of sarcoptic mange (caused by Sarcoptes scabiei) and biting lice infestations (caused by Trichodectes canis).
For the treatment of adult roundworms (Toxocara cati) and adult intestinal hookworms (Ancylostoma tubaeforme). For the treatment of biting lice infestations (caused by Felicola subrostratus).
Dosage and administration:
≤ 2.5 kg
1 tube of Stronghold 15 mg (Rose coloured top)
2.6 – 5.0 kg
1 tube of Stronghold 30 mg (Violet coloured top)
5.1 – 10.0 kg
1 tube of Stronghold 60 mg (Brown coloured top)
10.1 – 20.0 kg
1 tube of Stronghold 120 mg (Red coloured top)
20.1 – 40.0 kg
1 tube of Stronghold 240 mg (Green coloured top)
> 40.0 kg
Appropriate combination of tubes
≤ 2.5 kg
1 tube of Stronghold 15 mg (Rose coloured top)
2.6 – 7.5 kg
1 tube of Stronghold 45 mg (Blue coloured top)
> 7.5 kg
Appropriate combination of tubes
For the treatment and prevention of flea infestations in dogs and cats, Stronghold should be administered at monthly intervals throughout the flea season, starting one month before fleas become active.
For use as part of a treatment strategy for flea allergy dermatitis, Stronghold should be administered at monthly intervals.
Through a reduction in the flea population, monthly treatment of pregnant and lactating queens and bitches will aid prevention of infestations in the litter up to seven weeks of age.
For the treatment of adult roundworm infections in dogs and cats, a single dose of Stronghold should be administered.
For the treatment of adult hookworm infections in cats, a single dose of Stronghold should be administered.
For the treatment of biting lice infestations in cats and dogs, a single dose of Stronghold should be administered.
For the complete elimination of sarcoptic mange mites in dogs, a single dose of Stronghold should be administered for two consecutive months.
For the treatment of ear mites in cats, a single dose of Stronghold should be administered.
A single dose of Stronghold should be administered. Loose debris should be gently removed from the external ear canal at each treatment. A further veterinary examination 30 days after treatment is recommended as some animals may require a second treatment.
For the prevention of heartworm disease in dogs and cats, Stronghold may be administered year round or at least within one month of the animal’s first exposure to mosquitoes and monthly thereafter until the end of the mosquito season. The last dose should be given within one month of the last exposure to mosquitoes.
Remove the Stronghold tube from its protective package. Holding the tube upright, firmly depress the cap to puncture the applicator seal, then remove the cap. Part the hair at the base of the animal’s neck in front of the shoulder blades to expose a small area of skin. Apply the tip of the Stronghold tube directly to the skin without massaging. Squeeze the tube firmly to empty the contents in one spot. Avoid contact between Stronghold and fingers. Stronghold should be administered as a single topical application of a unit dose delivering a minimum of 6 mg/kg selamectin. When concurrent infestations or infections in the same animal are to be treated with Stronghold, only one topical application of the recommended 6 mg/kg dose should be administered at any one time.
For animal treatment only.
For external use only. This product is to be applied to the skin surface only. Do not administer orally or parenterally.
Do not use in animals under 6 weeks of age. Do not use in cats that are suffering from concomitant disease, or are debilitated and underweight (for size and age).
Do not apply when the hair coat is wet. However, shampooing or soaking the animal 2 or more hours after treatment will not reduce the efficacy of Stronghold.
Keep treated animals away from fires and other sources of ignition for at least 30 minutes or until the hair coat is dry.
Do not allow treated animals to bathe in water courses until at least two hours after treatment.
Avoid direct contact with treated animals until the application area is dry. Keep children away from treated animals for at least 30 minutes following application of Stronghold or until the hair coat is dry.
For ear mite treatment, do not apply directly to the ear canal.
Use of Stronghold in cats has occasionally been associated with a mild, transient hair loss at the site of application. In a small proportion of these cases, transient focal irritation may also be observed. The hair loss and irritation are normally self-resolving, but symptomatic therapy may be applicable in some circumstances.
On rare occasions, application of Stronghold may produce a local temporary clumping of the hair at the application site and/or the appearance of a small quantity of a white powder. This is normal and will disappear typically within 24 hours of administration and does not affect either the safety of efficacy of Stronghold.
Exceptionally, as with other macrocyclic lactones, reversible neurological signs,including seizures, have been observed after use of the product.
It is important to apply the dose to the correct site as indicated to minimise the quantity that the animal can lick off. If significant licking does occur, a brief period of hypersalivation may rarely be observed in cats.
Wash hands after use and wash off any product in contact with the skin immediately with soap and water. If accidental eye exposure occurs, flush the eyes immediately with water and seek medical attention.
People with sensitive skin or known allergy to products of this type should handle Stronghold with caution.
Do not smoke, eat or drink while handling Stronghold.
Any unused product or waste material should be disposed of in accordance with local requirements. Selamectin may adversely affect fish or certain water-borne organisms on which they feed. Containers and residual contents should be disposed of along with collected domestic refuse to avoid contamination of any water courses.
Keep out of the reach and sight of children.
Do not store above 30°C. Store in the unopened foil package in a dry place.
Highly Flammable - Keep away from heat, sparks, open flame or other sources of ignition.
Stronghold is available in packs of three tubes (all tube sizes), six tubes (all tube sizes except Stronghold 15 mg) and 15 tubes (Stronghold 15 mg only).
Following administration of Stronghold, adult fleas on the animal are killed and no viable eggs are produced and larvae (found only in the environment) are also killed. This stops flea reproduction, breaks the flea life cycle and may aid in the control of existing environmental flea infestations in areas to which the animal has access.
Stronghold may be safely administered to animals infected with adult heartworms, however it is recommended, in accordance with good veterinary practice, that all animals 6 months of age or more living in countries where a vector exists should be tested for existing adult heartworm infections before beginning medication with Stronghold. It is also recommended that dogs should be tested periodically for adult heartworm infections, as an integral part of a heartworm prevention strategy, even when Stronghold has been administered monthly. Stronghold is not effective against adult Dirofilaria immitis.
If a dose is missed for heartworm prevention and a monthly interval between dosing is exceeded then immediate administration of the product and resumption of monthly dosing will minimise the opportunity of a development of adult heartworms. When replacing another heartworm preventative product in a heartworm disease prevention programme, the first dose of Stronghold must be given within a month of the last dose of the former medication.
Stronghold was administered at 10 times the recommended dose to cats and dogs and no undesirable effects were observed.
Stronghold was also administered at 3 times the recommended dose to breeding male and female cats and dogs, including pregnant and lactating females nursing their litters and no undesirable effects were observed.
Stronghold was also administered at 5 times the recommended dose to ivermectin-sensitive collies, and no undesirable effects were observed.
Stronghold was also administered at 3 times the recommended dose to cats and dogs infected with adult heartworms and no undesirable effects were observed.
In extensive field testing, no interactions between Stronghold and routinely used veterinary medicinal products or medical or surgical procedures were observed.
All prices include VAT where applicable.
Under almost all products on our website is an Estimated dispatch time, check this for a delivery prediction specific to the item you are looking to purchase. These badges are updated live based on the stock levels we have and also those of our suppliers - so are usually very accurate, but cannot be guaranteed. In more general terms, we aim to dispatch all orders within 1 working day of receiving payment (and a prescription if required). If we cannot do so within 3 working days we will contact you by email.
For UK delivery, we charge the following:
Prices quoted are for delivery to all parts of mainland UK except certain Scottish postcodes (where the price is higher for items sent by courier. Delivery of food abroad (including Channel Islands, N. Ireland and other islands around the UK) is charged at a higher price and free delivery is not available. Temperature controlled products, such as Insulin, are also not always subject to the standard and/or free delivery options.
For full information on our delivery charges, including prices on heavy deliveries to Scotland and abroad, see our delivery information page.
We can deliver most items to all around the world, but prices do vary. The majority of light weight orders (less than 1.5kg) can be delivered for a flat rate of £10. For an accurate estimate of the delivery charge, please put the items you require in your basket and use the "Estimate Delivery" system on the shopping basket page (you only need to enter your country and postal/zip code) for a quick quote. For deliveries to the USA you may need to go to the checkout page and enter your full address to get a quote (as some services need your state in order to quote too). For more information on international deliveries, please see our delivery information page.
Due to air freight restrictions aerosols cannot ever be sent abroad by Royal Mail. We appreciate your understanding.
Some products, such as insulin and frozen food, need to be delivered in insulated packaging to prevent them from getting too warm (or too cold) during transit from us to you. Purchasing any of these items in your order will result in a £1.99 charge being added to the total to cover the high cost of the insulated packaging materials. You only pay the £1.99 once per order, regardless of how many temperature controlled items you purchase in that order.
Please call us as soon as possible if you need to amend or cancel an order on 01582 842096. If your order has been processed for dispatch we will be unable to cancel or amend the order. You will however be able to return your product for a full refund*.
To return an item, you must contact us by phone or email to arrange this BEFORE posting any product back to us. We will explain the process at this stage for you.
*For full details on returns, see our terms and conditions page.
Below are some recent questions we've received regarding Stronghold Spot On for Dogs & Cats, including answers from our team.
George my cat
How long does it take before I see no more fleas on George ?
Thank you for your question, it takes 2-3 hours to kill the fleas. We do recommend that the house is treated to, to help prevent the cat from getting re-infected as fleas lay the larvae in sofas, blankets and other household items. We also recommend putting all blankets ect. in the washing machine on a boiling wash to kill any larvae and fleas present.
I hope this helps, if you have any further enquiries please do not hesitate to contact us.
is stronghold still effective when they are in the sun bathing everyday?
It is true that ultra-violet radiation tends to degrade many compounds, but the active ingredient of Stronghold (Selamectin) is absorbed hrough the skin and so is out of reach of the UV. I am sure it will remain effective despite sunbathing.
I use stronghold on my 8 month old Cocker Spaniel, I have noted that it is effected against some types of worms, do I need to worm my dog every three months with a product like Drontal wormer too ? I am confused as to what worms are killed by what product and if it's necessary for me to purchase both products ? Thanks
If you use Stronghold then it is unlikely that you need to give any other worm treatment at all. Stronghold is not effective against tapeworms, but they are rare in dogs now apart from a very few areas. If tapeworms are present, they are usually harmless to the dog, but you will see segments of tapeworm. In that case you can use a multi-wormer Drontal, or just Droncit which is purely active against tapeworms. Most people who use Stronghold do not use a separate wormer as well. Obviously your vet can advise you on this as he/she is providing the prescription for it.
Stronghold was administered to my cat but not put directly onto the skin. This seems to have made it ineffective 3 days later I am still finding fleas. Can I give an extra dose or will this cause problems?
The safest thing to do would be to apply a different type of flea treatment which will not be at all likely to cause a problem with whatever Stronghold did reach your cat's skin. I would suggest Advantage or Frontline. They have different active ingredients.
As far as seeing fleas is concerned, it is quite common at this time of year for there to be a huge explosion of fleas emerging from eggs (and pupae etc) which were laid earlier in the year. You can then get lots of new fleas jumping onto your cat every day, even though many will die after a while due to the treatment applied. Therefore you might be seeing fleas even if the Stronghold had been applied perfectly. All these fleas will eventually die, but you might have to be a bit patient (and ideally treat the house with something like Indorex).
Can I use stronghold on my heavily pregnant cat?
Stronghold is safe to give during pregnancy or lactation. There is a general guide that all medication should be avoided if possible during the first third of pregnancy. It should however be perfectly safe, and a good idea, to use Stronghold in a heavily pregnant cat.
Can stronghold 45 mg for cats be used on a dog. If not, why not?
Licensed medicines are strictly controlled and it is against the law for anyone other than the vet to prescribe Stronghold. If the prescribing vet considers using a medicine in some way differently from its legal authorisation, then he can do so and it is up to him to justify his decision afterwards if something goes wrong. Having said that, I expect that most vets would consider it perfectly OK to use the Cat Stronghold on a dog if it was of suitable weight, age etc.
How soon after application will the irritation stop.
This normally takes a few days. However it depends on how many fleas are present in the environment, how sensitised the dog has become to flea saliva(injected when they bite), and whether or not the irritation is caused or complicated by other things. All fleas on the dog should die, but more will jump on for a while. They too will die, but if there are lots living in the environment, it will take a while for them all to die. For this reason, it is often recommended to use a household flea spray for carpets and bedding etc as well. All fleas will go in time without, but it takes longer. Sometimes the dog's skin can have a mild, secondary bacterial infection which prolongs irritation. This can be treated as well if needs be, but you vet will have checked for this. If the irritation is persisting longer than you think is reasonable, it is best to return to your vet for advice. There will be a reason, though it is very unlikely to be the Stronghold not killing fleas, as it is generally found to be extremely effective.