Parasiticide Guide


How to use the guide

This guide will help you choose and identify parasiticide products for cats, dogs, ferrets and rabbits, for the treatment of individual animals, or for creating a practice parasiticide policy. It contains products authorised as veterinary medicines in the UK. It does not include insect repellents classed as biocides (e.g. products containing margosa extract). For full information on prescribing and using the parasiticides (including the specific authorised indications, dose, contraindications, adverse effects, interactions, handling, water stability etc.), consult the product's summary of product characteristics (available for each product on the Veterinary Medicines Directorate website). The notes further down this page, below the search results, offer more explanation about the terms used in the guide.


You can search using any or all of the following categories: species, active ingredient, brand, formulation, parasite.  For parasite and active ingredient, you can select several terms by clicking on the adjacent plus sign; deselect a term by clicking the adjacent minus sign. Each category has a blank area at the top of the drop-down menu, which you should select if you don’t want to use a particular category in your search.

We have made every effort to ensure that the guide is accurate and easy to use. If you spot anything that will help improve it, please let us know using the comments box at the end of this page. The guide was last updated in September 2019. Next update due December 2019.

For information on parasites, including risk assessment and management of infestation, visit the website of ESCCAP UK & Ireland

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Notes on search results

Parasite/disease: coverage is according to the authorised indications of the product. If a product's summary of product characteristics states that the product is active against Echinococcus species, this is indicated in the guide as "tapeworm incl. Echinococcus".

Use in pregnancy:  tick - the product information states it can be used in pregnancy; cross - the product information states it should not be used in pregnancy; ? - the product information states that safety in pregnancy is not established or is unclear about use in pregnancy or states that the product should only be used at certain stages of pregnancy.

Effect on flea larvae: products containing an insect growth regulator alone (lufenuron or pyriproxyfen) have a preventive effect only. Cyromazine (contained in Rearguard for the prevention of blowfly in rabbits) is an insect growth regulator that prevents the development of fly eggs.

Treatment interval: this is a guide to the usual treatment interval recommended in the product information. Check the product information for more detailed information, especially if a product covers a wide range of parasites.

Supply category: POM-V (prescription-only medicine – veterinarians: must be prescribed by a veterinary surgeon or supplied by a pharmacist against a veterinary surgeon’s prescription. NFA-VPS (non-food animal – veterinary surgeons, pharmacists and SQPs): can be supplied by a veterinary surgeon, a pharmacist or a suitably qualified person (SQP), no prescription required. AVM-GSL (authorised veterinary medicine – general sales list): can be supplied by any retailer, no prescription needed.


We will be very pleased to hear from you: use the comments box below to tell us anything about the guide.