Guideline V Post-marketing surveillance studies
Updated 29 May 2024
Applies to England, Scotland and Wales
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1. What is a post-marketing surveillance study
A post-marketing surveillance study is any study carried out after a veterinary medicinal product (VMP) has been authorised. The aim is to:
- identify, characterise or quantify an adverse event
- confirm the safety and/or efficacy profile of a VMP
- measure the effectiveness of risk management measures
These studies can take the form of non-interventional studies, in which a VMP is prescribed in the usual manner in accordance with the marketing authorisation.
2. Why is a post-marketing surveillance study needed
Before authorisation, the number of animals exposed to the VMP is restricted, so experience of adverse events within any specific population of the target species may be limited. Post-authorisation, the number of animals exposed becomes greater, and can reveal other adverse events that were not apparent during the pre-authorisation stage.
A Marketing Authorisation Holder (MAH) may elect to carry out a study to investigate many different aspects of a VMP, including if:
- the concurrent use of a specific product with the VMP results in previously unknown adverse events
- the use of the VMP in a particular breed of animal results in previously unknown adverse events
- the incidence of a particular adverse event is dependent on the characteristics of an animal treated with a specific product, such as age or weight
- the incidence of a particular adverse event is dependent on the existence of another underlying disorder
- the long-term use of a product gives rise to an adverse event
There may be many other reasons for the need for a post-marketing surveillance study. The VMD may require an MAH to carry out such a study, if they determine that there may be signals that require further investigation.
3. How is a post-marketing surveillance study carried out
Only animals treated with a particular VMP in the manner specified in the product literature can be included in a post-marketing surveillance study. The MAH may recruit animals that fit the criteria for the study to be performed. Once recruited, the animal will be treated as it would normally be treated for the condition it has, but the veterinarian providing that treatment will be required to monitor the animal more closely throughout the treatment.
4. What happens after the study
At the end of the study, the MAH will provide the VMD with the findings, which will determine whether there is or is not evidence of any adverse events. As a result of this, further regulatory action may be required. The VMD may require the MAH to update the product literature to, for example to:
- exclude the use of the VMP in a particular age-range or group of animals
- advise prescribers and end-users to perform closer monitoring of animals in a particular age-range or group of animals
- advise that the VMP is not used at the same time as another specific product
5. What types of studies are not included
Clinical trials in which a VMP is used in a manner not authorised for the species in question.