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. *The freephone number is free from most UK landlines only, mobiles are usually charged so we'd recommend calling our landline from your mobile or internationally.
Below are some recent questions we've received regarding Stronghold Spot On for Dogs & Cats, including answers from our team.Ask Your Own Question
Sorry that this product is out of stock, instead of having to keep checking back to see if we have it, we can send you a notification as soon as it comes back in stock.
We won't use any details you enter for any other purpose than letting you know when this is back in stock.
Please enter details for each method you'd like us to notify you by:
VioPoints are a way for us to say thank you for purchasing from VioVet.
You will receive VioPoints by purchasing this product, which can be redeemed for a discount on future purchases. For each 1000 points redeemed at the checkout, you will receive a 20p discount.
The number of VioPoints is shown on the product listing and they are awarded on dispatch of the order.
Terms and conditions apply.