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Suspected Adverse Events

No effective medicine is risk free and all medicines have the potential to cause adverse effects. Some of the adverse effects are known about when a veterinary medicine is first licensed, but those which occur rarely or are specific for certain breeds or groups of animals only come to light later when the products are used more widely.

An adverse event is an expression which describes a harmful and unintended reaction due to exposure to a medicine administered at its normal dose. The process of detecting, evaluating, understanding and preventing the adverse effects of medicines is known as pharmacovigilance.

The Veterinary Medicines Directorate (VMD) is responsible for veterinary pharmacovigilance in the UK. We record and monitor reports of adverse events to veterinary medicines in both animals and humans. An event may occur in an animal undergoing treatment or in an untreated animal in the same household as a treated animal. A human event may occur in a person administering a veterinary medicine, or a person exposed to a recently treated animal. If you would like to find out more about our pharmacovigilance activities, please read the following information leaflets.

Providing information arising from pharmacovigilance is a key element in promoting the safe and effective use of veterinary medicines.


Important information for Cat and Dog owners.

Last Updated: 4 August 2014

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